Cab mount structure for construction machinery

Abstract

To provide a cab mount structure of a construction machine allowing a vehicle height of the construction machine to be kept low while preventing interference between a frame and a travel device.SOLUTION: A cab mount structure comprises: a frame 12 which constitutes a vehicle body; a front mount part 24 which is connected to the frame 12 and on which a front part of a cab 15 is mounted; and a rear mount part 25 which is connected to the frame 12 and on which a rear part of the cab 15 is mounted, wherein the front mount part 24 and the rear mount part 25 support the cab 15 at a height where a lower surface of the cab 15 is at a lower position than that of an upper surface of the frame 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure for mounting a cab to a vehicle body of a construction machine. [Background technology]

[0002] Figure 7 shows a crawler carrier as an example of construction machinery. A frame 2 constituting the vehicle body of the crawler carrier 1 is rotatably attached via slewing wheels 4 to crawlers 3, which are traveling devices, 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.

[0003] The frame 2 is composed of two side members arranged along the front-to-rear direction of the vehicle body and multiple cross members arranged 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 these.

[0004] Prior art documents that disclose technology related to the frame structure of this type of construction machine include, for example, Patent Document 1 listed below. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-343638 Summary of the Invention [Problem to be solved by the invention]

[0006] In the construction machinery 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 this case, the higher the vehicle height of the loaded construction machinery, the higher the overall vehicle height becomes, increasing the possibility that the vehicle height limit will not be met on some roads. Furthermore, even at construction sites where construction machinery is in operation, it is conceivable that there will be situations where it is effective to lower the vehicle height of the construction machinery in order to avoid various obstacles.

[0007] 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 to place the cab 5 and the loading platform 6 on the frame 2, but doing so inevitably increases the vehicle height of the construction machine 1 to a certain extent. In particular, in the case of a slewing construction machine equipped with slewing wheels 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 attempts are made to lower the vehicle height of the construction machine, there is a natural limit as long as it is necessary to avoid interference between the frame and the traveling device.

[0008] SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a cab mounting 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 device. [Means for solving the problem]

[0009] The present invention relates to a cab mounting structure for a construction machine, which comprises a frame that constitutes 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 configured so that the front mounting section and the rear mounting section support the cab at a height such that the underside of the cab is positioned below the upper surface of the frame.

[0010] In the cab mount structure for a construction machine of the present invention, the front mount portion can be provided at a position forward of the front end of a traveling device provided below the frame, at a height lower than the frame.

[0011] 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.

[0012] In the cab mounting structure for a construction machine of the present invention, the rear mounting portion includes a rear mounting frame configured to mount a tether portion provided on the rear surface of the cab at a position higher than the upper surface of the frame, and the rear mounting frame may also be provided with a through hole that passes through the rear mounting frame in the front-to-rear direction. [Effects of the Invention]

[0013] 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 device. [Brief explanation of the drawings]

[0014] [Figure 1] 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. [Figure 2] FIG. 2 is a front view of the frame of FIG. 1. [Figure 3] FIG. 2 is a side view of the frame of FIG. 1. [Figure 4] 2 is a side view showing the configuration of the front part of the construction machine equipped with the frame of FIG. 1. [Figure 5] 5 is a side cross-sectional view particularly showing the state in which a tether is attached to the cab of the construction machine of FIG. 4. [Figure 6] 5 is a plan view particularly showing the configuration of the mooring portion provided on the rear surface of the cab in the construction machine of FIG. 4. FIG. [Figure 7] 1 is a side view showing a simplified example of a configuration of a crawler carrier as a construction machine. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] Figures 1 to 3 show an example of the configuration of a frame 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, a frame 12 constituting the body of the crawler carrier 10 is rotatably attached via slewing wheels 14 onto crawlers 13, which are traveling devices, 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.

[0017] 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 fore-and-aft direction of the vehicle, and a plurality of 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.

[0018] 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 typical construction machine, and the third side member 20c corresponds to the right side member. The first side member 20a constitutes the front portion of the left side member, and the second side member 20b constitutes the remaining portion (rear portion and middle portion) 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 positioned 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). However, the first side member 20a, which constitutes the front portion of the left side member, is positioned slightly inward (to the right) of the second side member 20b in the left-right direction of the vehicle. This is because the cab 15 is located on the front left side of the vehicle in the crawler carrier 10 (see FIG. 4) of this embodiment. In this embodiment, the cab 15 is supported relative to the frame 12 so that the lower part of the cab 15 is located below the upper surface of the frame 12, as will be described later. However, when arranging the cab in this manner, depending on the position of the side members, the side members may interfere with the placement of the cab 15. Therefore, of the side members that form the front part of the frame 12, the part that constitutes the side member on the side where the cab 15 is located (in this embodiment, the first side member 20a that forms the front part of the left side member) is positioned closer to the center (to the right) in the left-right direction of the vehicle. In the case of a construction machine in which the cab is located on the right front side of the vehicle, the front part of the right side member can be positioned closer to the left as necessary. The relationship between the placement of the cab and the structure of the side members will be described in detail later.

[0019] 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 first to fifth cross members 21a to 21e, in that 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 intermediate portion 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 intermediate portion 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.

[0020] The third and fourth cross members 21c and 21d have their ends connected to the middle portions of the second and third side members 20b and 21c, respectively. A turning center C is located between the third and fourth cross members 21c and 21d, and the upper portion of the turning ring 14 (see FIG. 4) is connected to this center from below. The fifth cross member 21e has its ends connected to the rear ends of the second and third side members 20b and 21c, respectively.

[0021] Support members are connected to the first and second side members 20a, 20b at the front end of the first side member 20a, the rear end of the first side member 20a, and an intermediate portion of the second side member 20b (between the third cross member 21c and the fourth cross member 21d), respectively, so as to extend to the left, thereby forming a left-side bracket 22 that supports the cab 15 (see FIG. 4) and accessories (not shown). Similarly, a support member is connected to the front portion of the third side member 20c so as to extend to the right from the third side member 20c, and together with a part of the first cross member 21a extending right from the front end of the third side member 20c, forms a right-side bracket 23 that supports a battery, accessories (not shown), etc.

[0022] Of the support members constituting the left bracket 22, the support member provided at the front end of the first side member 20a constitutes a front mount 24 that supports the front portion 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 portion of the cab 15. 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 as described above, but this position is forward of the front end of the traveling 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 traveling device (crawler) 13 and forward of the turning center C.

[0023] The front mount portion 24 and the rear mount portion 25 will be particularly described.

[0024] The front mount portion 24 is configured to include a beam 24a provided to extend leftward from the front end portion of the first side member 20a, and a tether portion 24b extending rearward of 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 portion positioned below the lower surface of the front end portion of the first side member 20a. As a result, the beam 24a is positioned one step lower than the side members 20 and cross member 21 that constitute the frame 12.

[0025] The right end of the beam 24a is fixed to the first side member 20a via a hanging bracket 24c connected to the front end surface of the first side member 20a, suspended from the front end of the first side member 20a. With this structure, the front mount 24 is supported by the first side member 20a in a cantilevered configuration, 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 portion of the first cross member 21a, thereby diagonally connecting the right end of the beam 24a to the middle portion of the first cross member 21a. This reinforces the cantilevered structure of the beam 24a, maintaining the support strength and rigidity of the front mount 24.

[0026] The mooring portion 24b is configured with a flange 24e that forms a horizontal surface and has two mooring 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 shape in the left-right direction of the vehicle in the direction of the beam 24a, and the two mooring holes 24f are aligned in that direction.

[0027] 4 and 5, a mooring portion 15a is provided on the front lower surface of the cab 15 at a position corresponding to the mooring portion 24b of the front mount portion 24. This mooring portion 15a has a mooring hole provided at a position corresponding to the mooring hole 24f provided in the flange 24e of the front mount portion 24. With the front portion of the cab 15 mounted on the front mount portion 24, the mooring holes are aligned and a mooring tool 28 such as an anchor or bolt is attached, thereby mooring the front portion of the cab 15 to the front mount portion 24.

[0028] 1 to 3, a rear mount frame 27 is connected to the upper surface of the rear mount portion 25. The rear mount frame 27 is a member provided so as to protrude above the frame 12 at the position of the rear mount portion 25. The rear mount frame 27 is configured with a main surface portion 27a, which is a member forming a surface perpendicular to the front-to-rear direction of the vehicle, and a tether portion 27b provided on the upper edge of the main surface portion 27a.

[0029] The mooring portion 27b is configured with a flange 27c that forms a surface along the horizontal direction and two mooring 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 surface that follows the horizontal direction at the same height as the upper edge of the main surface portion 27a. The flange 27c extends in an elongated shape 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 mooring holes 27d are aligned in that direction.

[0030] 4 to 6, a mooring portion 15b is provided in a vertically intermediate portion of the rear of the cab 15 at a position corresponding to the mooring portion 27b of the rear mount frame 27 attached to the rear mount portion 25. The mooring portion 15b is provided so as to protrude rearward from the rear surface of the cab 15, and is a structure for mounting and mooring the rear of the cab 15 to the rear mount frame 27. Usually, the cab-side structures for mounting and mooring the cab to the frame are often provided on the underside of the cab at both the front and rear ends, but in this embodiment, the mooring portion 15b is provided on the rear surface of the cab 15 rather than on the underside.

[0031] The mooring portion 15b has a mooring hole at a position corresponding to the mooring hole 27d provided in the flange 27c of the rear mounting frame 27. With the mooring portion 15b of the cab 15 mounted on the rear mounting frame 27, the mooring holes are aligned and a mooring device 28 such as an anchor or bolt is attached, thereby mooring the rear of the cab 15 to the rear mounting frame 27.

[0032] Also, as shown in Figure 3, a through hole 27e that penetrates the main surface portion 27a from front to back is provided in the center of the main surface portion 27a of the rear mount frame 27, so that piping, wiring, etc. can be installed through this through hole 27e as needed.

[0033] 4, the cab 15 is tethered to the frame 12 with its front portion mounted to the front mount portion 24 and its rear portion 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 portion 24, and this height is lower than the upper surface of the frame 12 by a dimension d (see FIG. 2).

[0034] In a typical construction machine, for example, in a conventional crawler carrier 1 as shown in FIG. 7, the cab 5 is mounted in a manner that supports its underside relative to 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 compared to 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 compared to the crawler carrier 1 of the conventional example. Whereas in the past the cab was mounted on the upper surface of the frame, in this embodiment a front mount portion 24 is provided at a height one step lower than the frame 12, and the cab 15 is mounted at the height of this front mount portion 24, thereby supporting the cab 15 in a lower position and lowering the vehicle height of the crawler carrier 10.

[0035] Here, if the position at which the cab 15 is supported is made too low, the cab 15 will interfere with the crawler 13, and 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 same height as 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 approximately the same height as the underside of the frame 12. In other words, the dimension d is approximately the thickness of the frame 12 constituted by the side members 20 and cross members 21.

[0036] As described above, 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 structure is the front mount portion 24, the rear mount portion 25, and the rear mount frame 27.

[0037] 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 located is located lower than the underside of the frame 12, but because 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 configured to rotate relative to the crawler 13 by the slewing ring 14, but the front mount 24 is located at a position where it will not interfere with the slewing ring 14 even when the frame 12 rotates, taking the rotational movement into consideration. That is, in a plan view (see FIG. 1 ), the minimum distance from the rotation center C to the front mount 24 is set longer than the maximum distance from the rotation center C to the end of the crawler 13.

[0038] On the other hand, since the rear mount portion 25 is located rearward of the front end of the crawler 13, if it were to be located lower than the underside of the frame 12 like the front mount portion 24, there is a possibility that it would interfere with the crawler 13. Therefore, a mooring portion 15b is provided on the rear surface of the cab 15 so as to protrude from the rear surface, and the mooring portion 15b is mounted to the rear mount frame 27 at a height above the top surface of the frame 12. Here, the height at which the mooring portion 15b is provided (i.e., the height at which the mooring portion 15b is mounted on the frame 12) may be the same as 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 portion 25, and the height at which the mooring portion 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 below the rear of the cab 15 in the crawler carrier 10, which is a construction machine. The structure for mounting and mooring the cab 15 (mooring portions 15b, 27b and mooring device 28) requires a certain amount of volume, and if this were to be located at the height of the upper surface of the frame 12, there is a possibility that it would get in the way of the devices, piping, and wiring that are located at the same height. Therefore, as in this embodiment, by installing the rear mounting frame 27 and locating the mooring portions 15b, 27b at a height higher than the frame 12 and providing a through hole 27e at a height between the mooring portions 15b, 27b and the frame 12, it is possible to pass the piping and wiring through the through hole 27e, and it is possible to avoid interfering with the layout of the devices in the limited space above the frame 12.

[0039] In this embodiment, the first side member 20a forming the front portion of the left side member is disposed closer to the inside (right) in the left-right direction of the vehicle than the second side member 20b forming the remaining portion of the left side member. This structure prevents the left side member from interfering with the placement 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 placed (left side member 20) wraps around to the inside in the left-right direction of the vehicle, allowing the cab 15 to be placed in an appropriate position without difficulty.

[0040] A ladder-like step 29 for getting on and off the cab 15 is provided at the left end of the beam 24a that forms the front mount portion 24. In the case of this embodiment, the position of the cab 15 is lower than in the conventional example, which has the advantage that it is easier to get on and off the cab 15 via the step 29.

[0041] In this embodiment, the front mount 24 and the mooring portion 24b are provided at a position lower than the frame 12 to support the front of the cab 15 from below, but it is also theoretically possible to provide the front mount and the mooring portion on the frame 12 side in front of the cab 15 and provide a corresponding mooring portion on the front of the cab 15 so that they are mounted on the frame 12 at the same height as the frame 12 or higher. In other words, the same structure as the rear mount 25 in this embodiment is used for the front mount, but reversed. 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.

[0042] As described above, the cab mount structure for the construction machine of this embodiment comprises the frame 12 that constitutes the vehicle body, the front mount section 24 that is connected to the frame 12 and to which the front part of the cab 15 is mounted, and the rear mount section 25 that is connected to the frame 12 and to which the rear part of the cab 15 is mounted, and the front mount section 24 and rear mount section 25 are configured to support the cab 15 at a height where the underside of the cab 15 is positioned 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.

[0043] 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 height lower 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.

[0044] 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.

[0045] 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 penetrates the rear mounting frame 27 from front to rear. In this way, it is possible to pass piping or wiring through the through-hole 27e, and to avoid interfering with the layout on the frame 12.

[0046] Therefore, according to each of the above-described embodiments, it is possible to keep the vehicle height of the construction machine low while avoiding interference between the frame and the traveling device.

[0047] The cab mount structure for a construction machine of the present invention is not limited to the above-described embodiment. For example, the construction machine to which the present invention is applied is not limited to a swivel-type crawler carrier, and the present invention can be applied to various vehicles as long as the construction machine has a cab mounted on the vehicle body. In addition, various modifications can be made to the implementation of the present invention without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0048] 12 frames 15 Cab 15b Mooring part 24 Front mount 25 Rear mount 27 Rear mounting frame 27e Through hole

Claims

1. A frame that constitutes 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 on which a rear portion of the cab is mounted, 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 positioned below an upper surface of the frame, the front mounting portion is provided at a height lower than the lower surface of the frame, 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, The rear mounting frame has a through-hole that penetrates the mounting frame from front to rear at a height between the anchoring portion and the upper surface of the frame. A cab mount structure for a construction machine.

2. The front mount is provided at a position forward of the front end of a traveling device provided below the frame.

2. The cab mount structure for a construction machine according to claim 1,

3. The front mounting portion is connected to the frame via a connecting member extending downward from the frame, and further includes a reinforcing member for reinforcing the connection by the connecting member; The reinforcing member is configured so that a base end portion is connected to one end portion of the front mount portion in the left-right direction, and a tip end portion is connected to an intermediate portion of the frame in the left-right direction.

3. The cab mount structure for a construction machine according to claim 1 or 2.

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