Work vehicle

Abstract

To provide a work vehicle in which a battery can be easily attached and detached.SOLUTION: A work vehicle 1 includes a main body frame 31 and a counterweight 29 attached to the rear of the main body frame 31. The counterweight 29 is attached to the main body frame 31 by a plurality of fixing bolts that screw into the counterweight 29 from the underside of the main body frame 31 through the main body frame 31.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] Work vehicles such as civil engineering and construction machinery generally have a main body frame mounted on a traveling device, and an engine, battery, hydraulic oil tank, swing motor, hydraulic pump, control valve, etc. are attached to the main body frame. A pair of left and right vertical ribs are welded to both sides of the main body frame in the vehicle width direction, and a horizontal rib is also provided to connect the pair of left and right vertical ribs. This pair of vertical ribs and horizontal ribs increases the rigidity of the work vehicle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3459353 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned work vehicle, a counterweight is attached to the main frame to enhance the operational stability of the work vehicle. This counterweight is attached to the transverse rib by "threading a fixing bolt from above through a mounting base provided on the upper side of the transverse rib into a counterweight mounting female thread formed on the mounting base."

[0005] However, in a work vehicle, if the battery is placed at the rear of the vehicle and a horizontal rib is placed behind that, when removing the battery from the vehicle, the battery must be raised quite high, making the battery removal process difficult.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a work vehicle that allows for easy installation and removal of a battery in the work vehicle. [Means for solving the problem]

[0007] [1] The work vehicle of the present invention comprises a main frame and a counterweight attached to the rear of the main frame. The counterweight is attached to the main frame by a plurality of fixing bolts that are threadedly engaged with the counterweight from the underside of the main frame through the main frame.

[0008] [2] In the work vehicle of the present invention, it is preferable that the main frame has a fastening portion at the rear of the vehicle, and that a recess is formed on the underside of the counterweight to expose the fastening portion.

[0009] [3] In the work vehicle of the present invention, it is preferable that the main body frame has a plurality of insertion holes corresponding to the plurality of fixing bolts, and the counterweight has a plurality of female threads corresponding to the plurality of fixing bolts.

[0010] [4] In the work vehicle of the present invention, of the plurality of fixing bolts, two fixing bolts located on either side of the fastening portion are designated as two first fixing bolts. It is preferable that a shim having a notch is attached around each of the two first fixing bolts located between the main frame and the counterweight.

[0011] [5] In the work vehicle of the present invention, the shim is preferably U-shaped.

[0012] [6] In the work vehicle of the present invention, it is preferable that the shim is mounted with an opening facing outward in the vehicle width direction. [Effects of the Invention]

[0013] According to the work vehicle of the present invention, the counterweight is attached to the main frame with "plurality of fixing bolts that screw into the counterweight from the underside of the main frame through the main frame." This eliminates the horizontal ribs required in conventional technology, making it easy to install and remove the battery without having to raise the battery too high. Furthermore, the omission of the horizontal ribs reduces the number of steps required to weld the horizontal ribs to the longitudinal ribs. Furthermore, the lack of rigidity in the main frame can be compensated for by having the counterweight also function as a reinforcing member for the main frame.

[0014] Furthermore, since the counterweight is attached to the rear portion of the vehicle body frame, the counterweight acts as a reinforcing member for the fastening portion at the rear portion of the vehicle. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an external perspective view of a work vehicle 1 according to an embodiment, as seen obliquely from the rear. [Figure 2] 1 is a perspective view of a main part of a work vehicle 1 according to an embodiment, viewed obliquely from the rear. [Figure 3] 10 is a view showing a state in which the fastening portion 31a is exposed from the recess 29a of the counterweight 29. FIG. [Figure 4] 1 is a perspective view of a main part of a work vehicle 1 according to an embodiment from which a counterweight has been removed, as viewed obliquely from the rear. [Figure 5] 10A and 10B are diagrams for explaining attachment of a counterweight to a main body frame. [Figure 6] 10 is a diagram illustrating a state in which shims 71 and 72 are attached to fixing bolts 41 and 42. FIG. [Figure 7] 7 is a diagram illustrating a state in which shims 71 and 72 are attached to fixing bolts 41 and 42, and is a diagram illustrating FIG. 6 as viewed from above. [Figure 8] 10 is a diagram for explaining the positional relationship between the counterweight 29 and the main body frame 31. FIG. [Figure 9]FIG. 2 is a partially see-through side view for explaining the positional relationship between the counterweight 29 and the main body frame 31. DETAILED DESCRIPTION OF THE INVENTION

[0016] The configuration of a work vehicle 1 according to an embodiment will be described below with reference to the drawings. In the embodiment described below, a crawler hydraulic excavator will be used as an example of a work vehicle. FIG. 1 is an external perspective view of the work vehicle 1 according to the embodiment, seen obliquely from the rear. Note that the external configuration of the work vehicle 1 according to the embodiment does not form the gist of the present invention, and therefore will only be described briefly. Furthermore, in each drawing used to explain the embodiment, components having the same function are given the same reference numerals, and duplicate explanations may be omitted.

[0017] (Overall composition) In Figures 1, 2, and 4 described below, arrows indicate the direction of each component relative to the vehicle body 10. That is, the left side of the work vehicle 1 when viewed from diagonally behind is referred to as "left," and the right side of the work vehicle 1 when viewed from diagonally behind is referred to as "right." The bottom side of the work vehicle 1 is referred to as "down," and the side opposite the bottom is referred to as "up." Figure 2 is a perspective view of the main parts of the work vehicle 1 according to the embodiment, viewed from diagonally behind. Figure 3 is a diagram showing the state in which the fastening part 31a is exposed from the recess 29a of the counterweight 29. Figure 4 is a perspective view of the main parts of the work vehicle 1 according to the embodiment, with the counterweight 29 removed, viewed from diagonally behind. Figure 5 is a diagram for explaining the attachment of the counterweight 29 to the main frame 31.

[0018] As shown in Figure 1, the work vehicle 1 comprises a traveling device 12, a body 10 rotatably mounted on top of the traveling device 12, a blade device 14 mounted on the front of the traveling device 12, and a work device 13 mounted on the front of the body 10. The vehicle body 10 is provided with a main body frame 31, and the main body frame 31 is provided with vertical ribs 35 at the top of both left and right ends to increase the rigidity of the main body frame (see Figure 4). The main body frame 31 is provided on the traveling device 12 so as to be rotatable about a vertical axis. A counterweight 29 is provided at the top of the rear part of the main body frame 31 to adjust the weight balance and increase the stability of the vehicle.

[0019] The traveling device 12 has a pair of crawlers 11 below both ends in the vehicle width direction (left and right direction) of the vehicle body 10. The working device 13 has a bucket attached as an attachment. The vehicle body 10, traveling device 12, working device 13, and blade device 14 are each driven by a corresponding hydraulic actuator (hydraulic motor, hydraulic cylinder, etc.).

[0020] The rear, left, right and front sides of the vehicle body 10 are covered by a rear cover 22 (see FIG. 1), a left side cover 23, a right side cover 26 and a front cover (not shown), respectively.

[0021] A canopy-type operator's cab 15 is provided on the vehicle body 10. The operator's cab 15 is provided with a canopy pole 24, an operator's seat 16, an operating lever 20, and the like.

[0022] The vehicle body 10 is equipped with a hydraulic pump (not shown), a battery (e.g., a battery pack) 33 for supplying power, and a power supply circuit (not shown) inside. The battery 33 is located above the main frame 31 and at the rear of the vehicle. The traveling device 12, working device 13, and blade device 14 can be explained in the same way as for known work vehicles, so explanations will be omitted here.

[0023] (Work vehicle 1) Figure 8 is a diagram illustrating the positional relationship between the counterweight 29 and the main body frame 31. Figure 9 is a partially see-through side view illustrating the positional relationship between the counterweight 29 and the main body frame 31. As shown in Figures 1, 2, 8 and 9, the work vehicle 1 according to this embodiment comprises a traveling device 12, a main body frame 31 that is provided on the traveling device 12 and has a fastening portion 31a at the rear of the vehicle, and a counterweight 29 attached to the rear and upper side of the main body frame 31.

[0024] (Counterweight 29) In the work vehicle 1 according to this embodiment, the counterweight 29 is attached to the main frame 31 by "fixing bolts 41, 42, 43, 44 that screw into the counterweight 29 from the underside of the main frame 31 through the main frame 31" (see FIG. 4).

[0025] The main frame 31 has a fastening portion 31a at the rear of the vehicle, and a recess 29a is formed on the underside of the counterweight 29 to expose the fastening portion 31a (see FIG. 3).

[0026] Figure 6 is a diagram illustrating a state in which shims 71, 72 are attached to fixing bolts 41, 42. Figure 7 is a diagram illustrating a state in which shims 71, 72 are attached to fixing bolts 41, 42, and is a view of Figure 6 viewed from above. Female threads 61, 62 are formed on the lower side of counterweight 29 at positions corresponding to the positions of insertion holes 51, 52 (see Figure 6), which will be described later, and further female threads 63, 64 are formed on the left and right outer sides thereof at a predetermined interval at positions corresponding to the positions of insertion holes 53, 54 (see Figure 6), which will be described later (see Figure 6).

[0027] (Main frame 31) In the work vehicle 1 according to this embodiment, a fastening section 31a having an opening 31b for securing the work vehicle 1 with a wire rope or the like is formed in the rear portion of the main body frame 31 (see FIG. 3). Plates 46, 47 are formed near both sides of the fastening section 31a that constitutes the main body frame 31 (see FIG. 5). As shown in FIG. 6, plates 46, 47 are formed with insertion holes 51, 52 for inserting the fixing bolts 41, 42, respectively. Furthermore, plates 48, 49 are formed at a predetermined distance on the left and right outside the positions where the insertion holes 51, 52 are formed. Plates 48, 49 are formed with insertion holes 53, 54 for inserting the fixing bolts 43, 44, respectively.

[0028] In the work vehicle 1 according to this embodiment, when the two fixing bolts 41, 42 on either side of the fastening portion 31a among the fixing bolts 41, 42, 43, 44 are defined as the two first fixing bolts 41, 42, shims 71, 72 having notches are attached around the two first fixing bolts 41, 42 located between the main body frame 31 and the counterweight 29 (see FIGS. 5, 6, and 7). Note that, although the shape of the shims 71, 72 is U-shaped in this embodiment, the shape is not limited to this as long as it has a notch.

[0029] In the work vehicle 1 according to this embodiment, the shims 71, 72 are mounted with the openings of the shims 71, 72 facing outward in the vehicle width direction (see FIG. 7).

[0030] Incidentally, a body frame equipped with a reinforcing rib (a horizontal rib connected and fixed to a pair of vertical ribs) for increasing the rigidity of the body frame is generally known. A counterweight is fixed to this horizontal rib. With the work vehicle 1 according to this embodiment, this horizontal rib is not necessary while maintaining the rigidity of the body frame 31. Therefore, omitting the horizontal rib eliminates the need for a process of attaching a counterweight to the vertical rib, thereby improving work efficiency.

[0031] (Fixing the counterweight 29 to the main frame 31) The fixing of the counterweight 29 to the main body frame 31 will be described below with reference to FIGS.

[0032] 5 and 6, the first fixing bolt 41 is threaded into the female thread 61 from the underside of the main frame 31 through the insertion hole 51, the plate 46, and the shim 71. The first fixing bolt 42 is threaded into the female thread 62 from the underside of the main frame 31 through the insertion hole 52, the plate 47, and the shim 72. The second fixing bolt 43 is threaded into the female thread 63 from the underside of the main frame 31 through the insertion hole 53 and the plate 48. The second fixing bolt 44 is threaded into the female thread 64 from the underside of the main frame 31 through the insertion hole 54 and the plate 49. In this way, the counterweight 29 is fixed to the rear edge of the main frame 31.

[0033] Therefore, the main body frame 31 has insertion holes 51, 52, 53, and 54 corresponding to the fixing bolts 41, 42, 43, and 44, respectively. The counterweight 29 has female threads 61, 62, 63, and 64 corresponding to the fixing bolts 41, 42, 43, and 44, respectively. Therefore, the counterweight 29 can be easily fixed to the main body frame 31.

[0034] The shims 71 and 72 are members (position adjustment members) for adjusting the height position of the counterweight 29 from the main frame 31. Each of the shims 71 and 72 has a U-shaped opening (cutout) 71a or 72a formed therein. The shims 71 and 72 are attached around each of the two fixing bolts 41 and 42 located between the main frame 31 and the counterweight 29, with the U-shaped openings (cutouts) 71a or 72a facing outward in the vehicle width direction of the vehicle body 10. Therefore, the shims 71 and 72 can be inserted laterally from the recess 29a side, making the insertion of the shims 71 and 72 even easier. This simplifies the adjustment of the height position of the counterweight.

[0035] (Effects of the embodiment) According to the work vehicle 1 of this embodiment, the counterweight 29 is attached to the main body frame 31 with fixing bolts 41, 42, 43, and 44 that screw into the counterweight 29 from the underside of the main body frame 31, via the main body frame 31. This improves the ease of installing and removing the counterweight 29. Furthermore, because the horizontal ribs are no longer necessary, there is no need to lift the battery 33 when installing or removing it, compared to a conventional structure in which there are horizontal ribs and the battery is provided in front of the horizontal ribs. This makes it easier to install and remove the battery 33 located inside the counterweight 29. Furthermore, the omission of the horizontal ribs reduces the number of steps required to weld the horizontal ribs to the vertical ribs.

[0036] Furthermore, according to the work vehicle 1 of this embodiment, the counterweight 29 is attached to the main body frame 31, and therefore the counterweight 29 functions in the same way as a conventional reinforcing rib, thereby supplementing the rigidity of the main body frame. In addition, a counterweight 29 is attached to the rear portion of the vehicle of the main frame 31. Therefore, the counterweight 29 acts as a reinforcing member for the fastening portion 31a at the rear portion of the vehicle.

[0037] Furthermore, in the work vehicle 1 according to this embodiment, the counterweight 29 has a recess (cutout) 29a formed on the underside thereof for exposing the fastening part 31a. Therefore, even if the counterweight 29 is attached to the rear part of the vehicle of the main frame 31, the counterweight 29 does not impair the function of the fastening part 31a.

[0038] Furthermore, in the work vehicle 1 according to this embodiment, the main frame 31 has insertion holes 51, 52, 53, and 54 corresponding to the fixing bolts 41, 42, 43, and 44, respectively, and the counterweight 29 has female threads 61, 62, 63, and 64 corresponding to the fixing bolts 41, 42, 43, and 44, respectively. This makes it easy to fix the counterweight to the main frame.

[0039] Furthermore, according to the work vehicle 1 of this embodiment, shims 71, 72 having notches are attached around each of the two first fixing bolts 41, 42 located between the main frame 31 and the counterweight 29. Therefore, the shims 71, 72 can be inserted from the side, making the insertion of the shims 71, 72 easy.

[0040] Furthermore, according to the work vehicle 1 according to this embodiment, the shims 71, 72 are U-shaped, and therefore the shims 71, 72 can be inserted more easily.

[0041] Furthermore, according to the work vehicle 1 of this embodiment, the shims 71, 72 are mounted with their openings facing outward in the vehicle width direction, so that the shims 71, 72 can be inserted from the recess 29a side, making the insertion of the shims 71, 72 even easier.

[0042] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, modifications such as those shown below are also possible.

[0043] (1) In the above-described embodiment, an electric motor-driven work vehicle is used as the work vehicle, but the present invention is not limited to this. For example, an engine-driven work vehicle may also be used.

[0044] (2) In the above-described embodiment, a work vehicle using crawlers as a traveling device is used as the work vehicle, but the present invention is not limited to this. For example, a work vehicle using tires as a traveling device may also be used.

[0045] (3) In the above embodiment, a bucket is used as the working device provided on the work vehicle, but the present invention is not limited to this. For example, a breaker may also be used. [Explanation of symbols]

[0046] 1...work vehicle, 10...body, 12...traveling device, 29...counterweight, 29a...recess (cutout), 31...main body frame, 31a...fastening portion, 33...battery (battery pack), 41, 42...first fixing bolt, 43, 44...second fixing bolt, 46, 47, 48, 49...flat plate, 51, 52, 53, 54...through hole, 61, 62, 63, 64...female thread, 71, 72...shim, 71a, 72a...cutout (opening)

Claims

1. The body frame and a counterweight attached to a vehicle rear portion of the main body frame, The counterweight is attached to the main body frame by a plurality of fixing bolts that are screwed into the counterweight from the underside of the main body frame via the main body frame. A work vehicle characterized by:

2. The main body frame has a fastening portion at the rear of the vehicle, and a recess is formed on the underside of the counterweight to expose the fastening portion.

2. The work vehicle according to claim 1.

3. the main body frame has a plurality of insertion holes corresponding to the plurality of fixing bolts, The counterweight has a plurality of female threads corresponding to the plurality of fixing bolts, 3. The work vehicle according to claim 2.

4. When two of the plurality of fixing bolts located on either side of the fastening portion are defined as two first fixing bolts, shims having notches are attached around each of the two first fixing bolts located between the main body frame and the counterweight.

4. A work vehicle according to claim 2 or 3.

5. The shim is U-shaped.

5. The work vehicle according to claim 4.

6. The shim is mounted with an opening facing outward in the vehicle width direction.

6. A work vehicle according to claim 4 or 5.

Images