JP2024081354A - Cab mount structure for construction machinery - Google Patents

Abstract

[Problem] To provide a cab mount structure for a construction machine that can keep the vehicle height of the construction machine low while avoiding interference between the frame and the traveling gear. [Solution] The structure comprises a frame (12) that constitutes the vehicle body, a front mount section (24) that is connected to the frame (12) and on which the front part of the cab (15) is mounted, and a rear mount section (25) that is connected to the frame (12) and on which the rear part of the cab (15) is mounted, and the front mount section (24) and the rear mount section (25) support the cab (15) at a height such that the bottom surface of the cab (15) is positioned below the top surface of the frame (12). [Selected Figure] Figure 1

Description

The present invention relates to a structure for mounting a cab to a vehicle body in a construction machine.

Figure 7 shows a crawler carrier as an example of a construction machine. The frame 2 that constitutes the vehicle body of the crawler carrier 1 is rotatably attached via slewing wheels 4 to the crawlers 3 that serve as the traveling device, and a cab 5 is installed at the front of the frame 2. A loading platform 6 is attached behind the cab 5 so that it can be raised and lowered.

The frame 2 is made up of two side members that run along the front-to-rear direction of the vehicle body, and multiple cross members that run along the left-to-right direction so as to intersect with the two side members, and the cab 5 and cargo bed 6 are supported on them.

Prior art documents that disclose technology related to the frame structure of this type of construction machine include, for example, Patent Document 1 below.

Japanese Patent Application Laid-Open No. 11-343638

In the case of construction machinery as described above, there is generally a demand to keep the vehicle height as low as possible. Construction machinery such as the crawler carrier 1 is often loaded onto a transport vehicle and transported on public roads, and in that case, the higher the vehicle height of the loaded construction machinery, the higher the overall vehicle height becomes, and depending on the road, there is a higher possibility that the vehicle height limit will not be cleared. Also, even at construction sites where construction machinery is in operation, there are likely to be situations where it would be effective to lower the vehicle height of the construction machinery in order to avoid various obstacles.

On the other hand, in the construction machine 1, it is necessary to avoid interference between the frame 2 and the various devices and structures attached to the frame 2 and the traveling device (crawler) 3. To achieve this, it is effective to support the frame 2 above the traveling device 3 and place the cab 5 and the loading platform 6 on the frame 2, but doing so will inevitably increase the vehicle height of the construction machine 1 to a certain extent. In particular, in the case of a slewing construction machine equipped with a slewing wheel 4 as described above, it is necessary to avoid interference between the frame 2 and the traveling device 3 while taking into consideration the rotation of the frame 2 relative to the traveling device 3. In other words, even if one tries to lower the vehicle height of the construction machine, there is a natural limit to how far it can be achieved since it is necessary to avoid interference between the frame and the traveling device.

In view of the above situation, the present invention aims to provide a cab mount structure for a construction machine that can keep the vehicle height of the machine low while avoiding interference between the frame and the traveling gear.

The present invention relates to a cab mounting structure for a construction machine, which comprises a frame constituting a vehicle body, a front mounting section connected to the frame and on which the front part of the cab is mounted, and a rear mounting section connected to the frame and on which the rear part of the cab is mounted, and which is characterized in that the front mounting section and the rear mounting section are configured to support the cab at a height such that the underside of the cab is positioned below the upper surface of the frame.

In the cab mounting structure for a construction machine of the present invention, the front mounting portion can be provided at a position forward of the front end of the traveling device provided below the frame, at a height lower than the frame.

In the cab mounting structure for a construction machine of the present invention, the rear mounting portion can be configured to mount a tether portion provided on the rear surface of the cab.

In the cab mounting structure of the construction machine of the present invention, the rear mounting section includes a rear mounting frame configured to mount a tether provided on the rear surface of the cab at a position higher than the upper surface of the frame, and the rear mounting frame can also include a through hole that passes through the rear mounting frame from front to rear.

The cab mount structure for a construction machine of the present invention has the excellent effect of keeping the vehicle height of the construction machine low while avoiding interference between the frame and the traveling gear.

1 is a plan view showing an example of a configuration of a frame of a construction machine according to an embodiment of the present invention; FIG. 2 is a front view of the frame of FIG. 1 . FIG. 2 is a side view of the frame of FIG. 1 . FIG. 2 is a side view showing a configuration of a front portion of the construction machine equipped with the frame of FIG. 1 . FIG. 5 is a side cross-sectional view particularly showing a state in which a tether is attached to the cab in the construction machine of FIG. 4 . FIG. 5 is a plan view particularly showing the configuration of a tether portion provided on a rear surface of a cab in the construction machine of FIG. 4 . FIG. 1 is a side view showing a simplified example of a configuration of a crawler carrier as a construction machine.

The following describes an embodiment of the present invention with reference to the attached drawings.

Figures 1 to 3 show an example of the frame configuration of a construction machine to which the cab mount structure of the present invention is applied, and Figure 4 shows an example of the configuration of a crawler carrier as a construction machine equipped with such a frame structure. As shown in Figure 4, the frame 12 constituting the vehicle body of the crawler carrier 10 is rotatably attached via a slewing wheel 14 to the crawler 13, which is the traveling device, and a cab 15 is installed at the front of the frame 12. Behind the cab 15, a loading platform 16 is attached so that it can be raised and lowered by a cylinder mechanism.

As shown in FIG. 1, the frame 12 is configured with three side members 20 (first side member 20a to third side member 20c) arranged along the front-rear direction of the vehicle, and multiple cross members 21 (first cross member 21a to fifth cross member 21e) arranged along the left-right direction so as to intersect with the three side members 20.

Of the side members 20a to 20c, the first side member 20a and the second side member 20b correspond to the left side member in a body frame of a general construction machine, and the third side member 20c corresponds to the right side member. The first side member 20a constitutes the front part of the left side member, and the second side member 20b constitutes the remaining part (rear part and middle part) of the left side member. The second side member 20b, which constitutes a part of the left side member, and the third side member 20c, which constitutes the right side member, are located equidistant in the left-right direction of the vehicle from the center of rotation (indicated by the symbol C in FIG. 1) of the slewing ring 14 (see FIG. 4), but the first side member 20a, which constitutes the front part of the left side member, is located slightly inward (right side) of the second side member 20b in the left-right direction of the vehicle. This is because the cab 15 is located on the left front side of the vehicle in the crawler carrier 10 (see FIG. 4) of this embodiment. In this embodiment, the cab 15 is supported on the frame 12 so that the lower part of the cab 15 is located below the upper surface of the frame 12 as described below. However, when performing such an arrangement, depending on the position of the side member, the side member may interfere with the arrangement of the cab 15. Therefore, of the side members forming the front part of the frame 12, the part constituting the side member on the side where the cab 15 is arranged (in this embodiment, the first side member 20a forming the front part of the left side member) is arranged closer to the center (rightward) in the left-right direction of the vehicle. In the case of a construction machine in which the cab is arranged on the right front side of the vehicle, the front part of the right side member may be arranged closer to the left as necessary. The relationship between the arrangement of the cab and the structure of the side members will be described in detail later.

The first and second side members 20a, 20b constituting the left side member and the third side member 20c constituting the right side member are connected to each other by the first to fifth cross members 21a to 21e in order from the front. The first and second side members 20a, 20b and the third side member 20c extend parallel to each other, but the first side member 20a extends further forward than the front end of the third side member 20c. The longitudinal middle portion of the first side member 20a is connected to the front end of the third side member 20c by the first cross member 21a. One end (left end) of the first cross member 21a is connected to the middle portion of the first side member 20a, the middle portion is connected to the front end of the third side member 20c, and the other end (right end) extends to the right of the third side member 20c. The rear end of the first side member 20a is connected by the second cross member 21b to the front end of the second side member 20b and to a forward position in the middle of the third side member 20c. One end (left end) of the second cross member 21b is connected to the front end of the second side member 20b, the middle part is connected to the rear end of the first side member 20a, and the other end (right end) is connected to the third side member 20c.

The third and fourth cross members 21c and 21d are connected at both ends to the middle parts of the second and third side members 20b and 21c, respectively. The turning center C is located between the third and fourth cross members 21c and 21d, and the upper part of the turning ring 14 (see Figure 4) is connected to this center from below. The fifth cross member 21e is connected at both ends to the rear ends of the second and third side members 20b and 21c, respectively.

Support members are connected to the front end of the first side member 20a, the rear end of the first side member 20a, and the middle part of the second side member 20b (between the third cross member 21c and the fourth cross member 21d) so as to extend leftward from the first and second side members 20a, 20b, respectively, forming a left bracket 22 that supports the cab 15 (see FIG. 4) and auxiliary equipment (not shown). Similarly, a support member is connected to the front part of the third side member 20c so as to extend rightward from the third side member 20c, and together with a part of the first cross member 21a that extends rightward from the front end of the third side member 20c, forms a right bracket 23 that supports a battery and auxiliary equipment (not shown).

The support members constituting the left bracket 22 are arranged such that the support member provided at the front end of the first side member 20a constitutes a front mount 24 that supports the front of the cab 15 (see FIG. 4), and the support member provided at the rear end of the first side member 20a constitutes a rear mount 25 that supports the rear of the cab 15. As described above, the position of the front mount 24 in the longitudinal direction of the vehicle is the same as the position of the front end of the first side member 20a, but this position is forward of the front end of the running device (crawler) 13. The position of the rear mount 25 in the longitudinal direction of the vehicle is rearward of the front end of the running device (crawler) 13 and forward of the turning center C.

The front mounting section 24 and rear mounting section 25 will be described in particular.

The front mounting portion 24 is configured with a beam 24a extending leftward from the front end of the first side member 20a, and a tether portion 24b extending rearward from the beam 24a. As shown in Figures 1 to 3, the beam 24a is supported by the first side member 20a with the upper surface of its right end positioned below the lower surface of the front end of the first side member 20a, and is therefore positioned at a lower height than each of the side members 20 and cross member 21 that make up the frame 12.

The right end of the beam 24a is fixed to the first side member 20a in a manner that it is suspended from the front end of the first side member 20a via a hanging bracket 24c connected to the front end surface of the first side member 20a. With this structure, the front mount section 24 is supported by the first side member 20a in a cantilever structure, and a reinforcing member 24d is further connected to the right end of the beam 24a. The reinforcing member 24d is an elongated plate-like member with one end connected to the right end of the beam 24a and the other end connected to the middle part of the first cross member 21a, thereby connecting the right end of the beam 24a and the middle part of the first cross member 21a at an angle. In this way, the cantilever structure of the beam 24a is reinforced, and the support strength and rigidity of the front mount section 24 are maintained.

The tethering portion 24b is configured with a flange 24e that forms a horizontal surface and has two tethering holes 24f that penetrate the flange 24e from top to bottom (see Figure 1). The flange 24e is a plate-shaped member that extends rearward from the upper rear end of the beam 24a and forms a horizontal surface at the same height as the upper surface of the beam 24a. The flange 24e extends in an elongated manner in the left-right direction of the vehicle along the direction of the beam 24a, and the two tethering holes 24f are aligned in that direction.

On the other hand, as shown in Figures 4 and 5, a tether 15a is provided on the front underside of the cab 15 at a position corresponding to the tether 24b of the front mount 24. This tether 15a has a tether hole at a position corresponding to the tether hole 24f provided in the flange 24e of the front mount 24. With the front of the cab 15 mounted on the front mount 24, the tether holes are aligned and a tether 28 such as an anchor or bolt is attached, so that the front of the cab 15 is tethered to the front mount 24.

The rear mount frame 27 shown in Figs. 1 to 3 is connected to the upper surface of the rear mount section 25. The rear mount frame 27 is a member that is provided so as to protrude above the frame 12 at the position of the rear mount section 25. The rear mount frame 27 is configured with a main surface section 27a, which is a member that forms a surface perpendicular to the front-to-rear direction of the vehicle, and a tether section 27b provided on the upper edge of the main surface section 27a.

The tether portion 27b is configured with a flange 27c that forms a horizontal surface and two tether holes 27d that penetrate the flange 27c from top to bottom (see FIG. 1). The flange 27c is a plate-shaped member that protrudes forward and backward from the upper edge of the main surface portion 27a, and forms a horizontal surface at the height of the upper edge of the main surface portion 27a. The flange 27c extends in an elongated manner in the left-right direction of the vehicle in the direction of the rear mount portion 25 and the main surface portion 27a, and the two tether holes 27d are aligned in that direction.

On the other hand, as shown in Figures 4 to 6, a tether 15b is provided in the vertically middle portion of the rear of the cab 15 at a position corresponding to the tether 27b of the rear mounting frame 27 attached to the rear mounting part 25. The tether 15b is provided to protrude rearward from the rear surface of the cab 15, and is a structure for mounting and tethering the rear of the cab 15 to the rear mounting frame 27. Usually, the cab-side structure for mounting and tethering the cab to the frame is often provided on the underside of the cab at both the front and rear, but in this embodiment, the tether 15b is provided on the rear surface of the cab 15 instead of the underside.

The tether portion 15b has a tether hole at a position corresponding to the tether hole 27d provided in the flange 27c of the rear mounting frame 27. With the tether portion 15b of the cab 15 mounted on the rear mounting frame 27, the tether holes are aligned and a tethering device 28 such as an anchor or bolt is attached, so that the rear of the cab 15 is tethered to the rear mounting frame 27.

As shown in FIG. 3, a through hole 27e is provided in the center of the main surface 27a of the rear mount frame 27, penetrating the main surface 27a from front to rear. If necessary, piping, wiring, etc. can be installed through this through hole 27e.

As shown in FIG. 4, the cab 15 is tethered to the frame 12 with its front mounted to the front mount 24 and its rear mounted to the rear mount frame 27. Here, the underside of the cab 15 is parallel to the plane of the frame 12, but the height at which the underside of the cab 15 is supported is the height of the flange 24e of the front mount 24, which is lower than the upper surface of the frame 12 by dimension d (see FIG. 2).

In a normal construction machine, for example, in a conventional crawler carrier 1 as shown in FIG. 7, the cab 5 is mounted in such a way that its underside is supported against the upper surface of the frame 2. That is, the height of the underside of the cab 5 is at the same height as the upper surface of the frame 2 or higher. In contrast, in the crawler carrier 10 of this embodiment shown in FIG. 4, the underside of the cab 15 is lower by a dimension d than the underside of the cab 5 shown in FIG. 7. That is, the vehicle height of the crawler carrier 10 of this embodiment is lower by a dimension d than the crawler carrier 1 of the conventional example. While the cab was conventionally mounted on the upper surface of the frame, in this embodiment, a front mount section 24 is provided at a lower height than the frame 12, and the cab 15 is mounted at the height of this front mount section 24, thereby supporting the cab 15 at a lower position and lowering the vehicle height of the crawler carrier 10.

Here, if the position at which the cab 15 is supported is made too low, the cab 15 will interfere with the crawler 13, so the position of the cab 15 cannot be lowered indefinitely. However, in a construction machine (crawler carrier) 10 having a structure in which the frame 12 is arranged above the traveling device (crawler) 13 as in this embodiment, there is no risk of an object at the height of the underside of the frame 12 interfering with the frame 12. Therefore, the cab 15 can be lowered to the extent that its underside is positioned at the same height as the underside of the frame 12. In other words, the dimension d is approximately the thickness of the frame 12, which is composed of the side members 20 and cross members 21.

As such, in this embodiment, the cab 15 is not supported on the upper surface of the frame 12. In this case, a separate structure is required to support the cab 15 on the frame 12. In this embodiment, this is the front mount portion 24, the rear mount portion 25, and the rear mount frame 27.

The front mount 24 is located below the frame 12 and supports the front of the cab 15 from below. The front mount 24 thus arranged is located lower than the bottom surface of the frame 12, but since the front mount 24 is located forward of the front end of the crawler 13, there is no risk of the front mount 24 interfering with the crawler 13. In this embodiment, the frame 12 is rotated relative to the crawler 13 by the slewing ring 14, but the front mount 24 is located at a position that does not interfere with the slewing ring 14 even when the frame 12 rotates, taking into account the slewing operation. That is, in a plan view (see FIG. 1), the minimum distance from the slewing center C to the front mount 24 is set longer than the maximum distance from the slewing center C to the end of the crawler 13.

On the other hand, the rear mount 25 is located behind the front end of the crawler 13, so if it is to be installed at a position lower than the bottom surface of the frame 12 like the front mount 24, there is a possibility that it will interfere with the crawler 13. Therefore, a tether 15b is provided on the rear surface of the cab 15 so as to protrude from the rear surface, and the tether 15b is mounted on the rear mount frame 27 at a height above the top surface of the frame 12. Here, the height at which the tether 15b is provided (i.e., the height at which the tether 15b is mounted on the frame 12) may be the height of the top surface of the frame 12, but in this embodiment, the rear mount frame 27 is provided above the rear mount 25, and the height at which the tether 15b is mounted is set higher than the top surface of the frame 12. This is because various devices, piping, and wiring may be installed at the rear lower part of the cab 15 in the crawler carrier 10, which is a construction machine. The structure for mounting and anchoring the cab 15 (the anchoring parts 15b, 27b and the anchoring device 28) requires a certain amount of volume, and if it is placed at the height of the upper surface of the frame 12, it may get in the way of the above-mentioned devices and piping and wiring that are placed at the same height. Therefore, as in this embodiment, by installing the rear mounting frame 27 and providing the anchoring parts 15b, 27b at a height above the frame 12 and providing a through hole 27e at a height between the anchoring parts 15b, 27b and the frame 12, it is possible to pass the piping and wiring through the through hole 27e, and to avoid interfering with the layout of the devices in the space above the frame 12, where space is limited.

In addition, in this embodiment, the first side member 20a forming the front part of the left side member is positioned inward (to the right) in the left-right direction of the vehicle compared to the second side member 20b forming the remaining part of the left side member. This is a structure to prevent the left side member from interfering with the positioning of the cab 15 when supporting the cab 15 at a position lower than the frame 12. The side member on which the cab 15 is positioned (left side member 20) wraps around inward in the left-right direction of the vehicle, so that the cab 15 can be positioned in an appropriate position without difficulty.

A ladder-shaped step 29 for getting on and off the cab 15 is provided at the left end of the beam 24a that constitutes the front mounting portion 24. In this embodiment, the position of the cab 15 is lower than in the conventional example, so there is also the advantage that it is easier to get on and off the cab 15 via the step 29.

In this embodiment, the front mount 24 and tether 24b are located lower than the frame 12 to support the front of the cab 15 from below, but it is theoretically possible to provide the front mount and tether on the frame 12 side in front of the cab 15 and provide a corresponding tether on the front side of the cab 15, and mount this to the frame 12 at the same height as the frame 12 or higher. In other words, the structure is the same as the rear mount 25 in this embodiment, but reversed for the front mount. However, doing so has the disadvantage that the front end of the vehicle protrudes from the front of the cab 15, increasing the turning radius in front of the vehicle body.

As described above, the cab mounting structure of the construction machine of this embodiment comprises the frame 12 that constitutes the vehicle body, a front mounting section 24 that is connected to the frame 12 and on which the front of the cab 15 is mounted, and a rear mounting section 25 that is connected to the frame 12 and on which the rear of the cab 15 is mounted, and the front mounting section 24 and rear mounting section 25 are configured to support the cab 15 at a height where the underside of the cab 15 is located below the upper surface of the frame 12. In this way, the cab 15 can be supported at a low position, and the vehicle height of the construction machine 10 can be lowered.

In this embodiment, the front mount 24 is provided at a position forward of the front end of the traveling device 13, which is provided below the frame 12, and at a lower height than the frame 12. In this way, the front mount 24 can support the front of the cab 15 from below while avoiding interference between the front mount 24 and the traveling device 13.

In this embodiment, the rear mount 25 is configured to mount the tether 15b provided on the rear surface of the cab 15. In this way, the rear mount 25 can support the rear of the cab 15 while avoiding interference between the rear mount 25 and the traveling device 13.

In this embodiment, the rear mounting portion 25 includes a rear mounting frame 27 configured to mount the tether portion 15b provided on the rear surface of the cab 15 at a position higher than the upper surface of the frame 12, and the rear mounting frame 27 includes a through hole 27e that passes through the rear mounting frame 27 from front to rear. In this way, it is possible to pass piping and wiring through the through hole 27e and avoid interfering with the layout on the frame 12.

Therefore, according to each of the above embodiments, it is possible to keep the vehicle height of the construction machine low while avoiding interference between the frame and the traveling gear.

The cab mount structure for a construction machine of the present invention is not limited to the above-mentioned embodiment. For example, the construction machine to which it is applied is not limited to a swivel-type crawler carrier, and it can be applied to various vehicles as long as it is a construction machine with a cab located on the body. In addition, when implementing the present invention, various modifications can be made without departing from the scope of the present invention.

12 Frame 15 Cab 15b Mooring portion 24 Front mounting portion 25 Rear mounting portion 27 Rear mounting frame 27e Through hole

Claims (4)

A frame constituting the vehicle body;
a front mount portion connected to the frame and on which a front portion of a cab is mounted;
a rear mount portion connected to the frame and to which a rear portion of the cab is mounted;
A cab mount structure for a construction machine, characterized in that the front mount portion and the rear mount portion are configured to support the cab at a height where a lower surface of the cab is located below an upper surface of the frame. 2. The cab mount structure for a construction machine according to claim 1, wherein the front mount portion is provided at a position forward of a front end of a traveling device provided below the frame and at a height lower than the frame. The cab mounting structure for a construction machine according to claim 1, wherein the rear mounting portion is configured to mount a tether portion provided on a rear surface of the cab. The rear mount portion includes a rear mount frame configured to mount a tether portion provided on a rear surface of the cab at a position higher than an upper surface of the frame,
4. The cab mount structure for a construction machine according to claim 3, wherein the rear mount frame is provided with a through hole passing through the rear mount frame in the front-rear direction.

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