Work vehicles

Abstract

To provide a work vehicle that can secure the strength of a vehicle body capable of carrying heavy loads while simplifying a rear structure of the vehicle body.SOLUTION: A vehicle body 3 has a body frame 18, which is a strength member and a support member for a mounted apparatus, provided at a lower part. The body frame 18 has: a large plate 68 which serves as a bottom plate; a pair of left and right vertical ribs 72, 74 erected on the large plate 68; and a lateral rib 76 erected on the large plate 68. The large plate 68 has, at a rear part, a notch 70 which is cut-out shaped so as to open toward the rear in a plan view. The vertical ribs 72, 74 are erected along left and right edges of the notch 70 with a gap in a left-right direction toward the rear. The lateral rib 76 is intersected with the vertical ribs 72, 74 and erected along a front edge of the notch 70. Furthermore, on the vertical ribs 72, 74, a counterweight 20 is fixed to the rear part with a fixing member 104, and the counterweight 20 serves both as a weight balance adjustment member for the vehicle body 3 and as a horizontal beam for the body frame 18.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with a hydraulically operated working device and an electric motor that serves as a drive source for the working device. [Background technology]

[0002] Conventionally known examples of work vehicles include hydraulic excavators and track loaders, each of which has a lower body to which crawlers or tires for traveling are attached, an upper body disposed on the lower body, and a hydraulically operated working device attached to the lower body or upper body.

[0003] Recently, work vehicles that are driven by electric motors instead of conventional engines have been developed. In electrifying work vehicles, it is common to install large, heavy batteries in the vehicle body to overcome shortfalls in operating time and power (see Patent Document 1: Japanese Patent No. 7025226). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7025226 Summary of the Invention [Problem to be solved by the invention]

[0005] The electric motor-driven work vehicle described above can accommodate a large and heavy battery by ensuring the strength of the main body frame, which serves as the base of the upper body. However, the main body frame is formed by complexly welding together multiple plates, brackets, reinforcing members, sealing members, etc. The rear section, where the battery is located, has a particularly large number of parts, which leads to issues such as a complex structure, poor assembly, and increased welding man-hours. [Means for solving the problem]

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a work vehicle that simplifies the rear structure of the vehicle body while ensuring the strength of the body so that heavy loads can be carried.

[0007] The present invention solves the above problems by the means described below.

[0008] A work vehicle comprising a vehicle body, a traveling device, a hydraulically operated working device, and a drive source for the traveling device or the working device, wherein the vehicle body comprises, at its lower part, a main body frame which is a strength member and a support member for mounted equipment, the main body frame having a large plate which serves as a bottom plate, a pair of left and right vertical ribs erected on the large plate, and a horizontal rib erected on the large plate, the large plate having a notch at its rear which is cut out so as to open rearward in a plan view, the vertical ribs erect along the left and right edges of the notch at intervals towards the rear, the horizontal ribs erect along the front edge of the notch, intersecting the vertical ribs, the large plate has lashing points at left and right rear end parts spaced apart by the notch, lashing point reinforcement members fixed on top of the lashing points, the lashing point reinforcement members being connected to the large plate ,mosquito The requirement is that the counterweight is sandwiched between a base and a counterweight mounting base, and the base is positioned so as to intersect with the fastening point reinforcement member.

[0009] According to the above configuration, by using the vertical ribs as reinforcing members, it is possible to reduce the number of reinforcing members disposed in the rear of the main frame. In other words, it is possible to provide a work vehicle that can ensure the strength of the body so that heavy loads can be carried while simplifying the rear structure of the body.

[0010] In addition, the vertical rib is The aforementioned It is preferable that the counterweight is fixed by a fixing member, and that the counterweight serves both as a weight balance adjustment member for the vehicle body and as a cross beam of the main body frame. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a work vehicle that simplifies the rear structure of the vehicle body while ensuring the strength of the body so that heavy loads can be carried. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view showing an example of a work vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a rear view of the work vehicle shown in FIG. [Figure 3] 3 is a perspective view of a main body frame of the work vehicle shown in FIG. 1. FIG. [Figure 4] 4 is a perspective view of the main body frame shown in FIG. 3 from another direction. [Figure 5] FIG. 5 is a perspective view of the main body frame shown in FIG. 4 with a counterweight attached thereto. [Figure 6] Fig. 6A is an enlarged view of the second mounting base shown in Fig. 3. Fig. 6B is an enlarged view of the fourth mounting base shown in Fig. 3. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram (perspective view from above the left rear) showing an example of a work vehicle 1 according to this embodiment. For ease of explanation, arrows may be used in the drawings to indicate up / down, left / right, and front / rear directions. In addition, in all drawings used to explain the embodiment, members having the same function are given the same reference numerals, and repeated explanations may be omitted.

[0015] First, a description will be given of the overall configuration of the work vehicle 1. A hydraulic excavator will be used as an example of the work vehicle 1. However, the work vehicle 1 is not limited to a hydraulic excavator.

[0016] As shown in FIG. 1, a work vehicle 1 includes a vehicle body including a lower body 2 and an upper body 3 disposed on the lower body 2 (the lower body 2 and the upper body 3 may be integrally configured).

[0017] The work vehicle 1 is equipped with working devices 12, 14 that are attached to the underbody 2 and upper body 3 and are operated by hydraulic pressure (hydraulic oil at a predetermined pressure). The underbody 2 is equipped with a traveling device 10 that allows the vehicle to travel. The upper body 3 is equipped with a driver's cab 16 at the front that is equipped with operating devices in which an operator sits and operates the vehicle for travel and work. The detailed configuration of the upper body 3 will be described later.

[0018] An example of the traveling device 10 is provided with a pair of crawlers (crawlers) 26 on the left and right. However, the traveling device 10 is not limited to the crawlers 26. As another example, the work vehicle 1 may be configured to have tires (not shown) instead of the crawlers 26. The crawlers 26 are driven (traveled) by a traveling hydraulic motor 28.

[0019] An example of the working device 12 is provided with a blade 24. The blade 24 is attached to the lower body 2 so that it can swing up and down (including forward and backward). The blade 24 is driven by a hydraulic cylinder (blade cylinder) 32. However, the working device 12 is not limited to the above configuration.

[0020] An example of the working device 14 includes a boom 42, an arm 44, and an attachment (a bucket in this embodiment) 46. However, the attachment 46 is not limited to a bucket. The boom 42 is attached to the upper body 3 so as to be swingable up and down (including a front-to-rear component). In this embodiment, a boom bracket (not shown) is provided between the upper body 3 and the boom 42. The boom bracket allows the boom 42 to swing left and right (including a front-to-rear component) relative to the upper body 3. Note that the boom bracket may be omitted. The arm 44 is attached to the boom 42 so as to be swingable up and down (including a front-to-rear component). The attachment 46 is attached to the arm 44 so as to be swingable up and down (including a front-to-rear component). The boom 42 is driven by a hydraulic cylinder (boom cylinder) 52. The arm 44 is driven by a hydraulic cylinder (arm cylinder) 54. The attachment 46 is driven by a hydraulic cylinder (bucket cylinder) 56. However, the working device 14 is not limited to the above configuration.

[0021] The drive mechanism for driving the traveling hydraulic motor 28 and each hydraulic cylinder is composed of, for example, a hydraulic pump driven by a drive source, a control valve, etc. (none of which are shown). The operator operates the operating device to actuate the control valve, which controls the supply of hydraulic oil at a predetermined pressure delivered from the hydraulic pump to the traveling hydraulic motor 28 and each hydraulic cylinder. This allows the traveling device 10 to travel and the working devices 12, 14 to perform work. One or more hydraulic pumps that make up the drive mechanism may be provided depending on the configuration and load of the working devices 12, 14 and the traveling device 10, etc.

[0022] In this embodiment, the work vehicle 1 is equipped with an electric motor (not shown) as the drive source. One or more electric motors constituting the drive source are provided depending on the number of hydraulic pumps and the rated output. As another example of a drive source, an engine may be used in addition to the electric motor (not shown).

[0023] The work vehicle 1 also includes an on-board charger 62 that supplies power to the electric motor. The power output from the on-board charger 62 is supplied to the electric motor via a battery pack 64 and an inverter (not shown). The battery pack 64 includes a first storage battery (e.g., a lithium-ion storage battery) that stores the supplied power, a control unit that controls the supply of power to the electric motor and the storage battery (first storage battery), and the like (all not shown). A second storage battery (e.g., a lead storage battery) and various switches (controllers) are connected to the battery pack 64 (all not shown).

[0024] Other mechanisms for travel and work in the work vehicle 1 according to this embodiment are similar to those of known work vehicles (hydraulic excavators), and therefore detailed description will be omitted.

[0025] Next, the configuration of the upper body 3 will be described in detail. Figure 2 is a rear view showing the rear structure of the work vehicle 1 (the battery cover 60 and counterweight 20 are not shown). The upper body 3 has a main body frame 18 at its lower part. The main body frame 18 is a strength member for the upper body 3 and a support member for the onboard equipment. The upper body 3 has a battery pack 64 attached to the main body frame 18 and supplies power to the electric motor. The upper body 3 has a counterweight 20 attached to the main body frame 18 and adjusts the weight balance of the vehicle body.

[0026] 3 and 4, the main body frame 18 is integrally formed by welding together plate materials, beam materials, etc. that have been processed into a predetermined shape. Specifically, the main body frame 18 includes a large plate 68, vertical ribs 72 and 74, and a horizontal rib 76.

[0027] The large plate 68 is a plate member that serves as the bottom plate of the main body frame 18. The large plate 68 has a notch 70 at its rear. The notch 70 is formed so as to open rearward in a plan view. The large plate 68 has lashing points 78, 79 (mechanisms for engaging binding members (not shown) to prevent the work vehicle 1 from drifting during transportation or parking) at its left and right rear ends, spaced apart from each other by the notch 70. lashing point reinforcement members 88, 90 are fixed to the lashing points 78, 79. The vertical ribs 72, 74 are erected in pairs on the left and right sides of the large plate 68, starting from the front of the large plate 68 and extending in the front-rear direction along the left and right edges of the notch 70, with a gap between them in the left-right direction toward the rear. The horizontal rib 76 intersects with the vertical ribs 72, 74 and extends in the left-right direction along the front edge of the notch 70 on the large plate 68.

[0028] According to the above configuration, the vertical ribs 72, 74 function as vertical beams of the main body frame 18, which makes it possible to reduce and simplify the strength members disposed at the rear of the main body frame 18. Furthermore, it is possible to ensure the strength of the vehicle body (in this embodiment, the upper body 3) capable of carrying heavy objects.

[0029] Next, the mounting structure of the battery pack 64 and the counterweight 20 will be described.

[0030] The vertical rib 72 includes a first mounting base 80 for mounting the battery pack 64, and a second mounting base 82 for mounting the battery pack 64 and the counterweight 20. The vertical rib 74 includes a third mounting base 84 for mounting the battery pack 64, a floor frame (not shown), and a hydraulic oil tank (not shown), and a fourth mounting base 86 for mounting the battery pack 64, the floor frame, and the counterweight 20.

[0031] As an example, the first mounting base 80 is a plate that is roughly L-shaped in front view, extending rightward from the protruding portion 72a of the vertical rib 72 with its front portion abutting against the rear surface of the horizontal rib 76, and then bending at a roughly right angle from its end downward (toward the large plate 68). The first mounting base 80 has one mounting hole (screw hole) 80a on its top surface. However, the first mounting base 80 is not limited to this configuration.

[0032] As an example, the second mounting base 82 is a plate that is generally L-shaped in side view, extending rearward from the protruding portion 72b of the vertical rib 72 and then bending at a generally right angle from that end along the rear end of the vertical rib 72. The second mounting base 82 has one mounting hole (screw hole) 82a on its top surface. The second mounting base 82 also has a first counterweight mounting portion 92 for mounting the counterweight 20. The first counterweight mounting portion 92 has one mounting hole (screw hole) 92a. However, the second mounting base 82 is not limited to this configuration.

[0033] As an example, the third mounting base 84 is a plate that is generally L-shaped in front view, extending left front from the protrusion 74a of the vertical rib 74, straddling the horizontal rib 76, and then bending at a generally right angle from its end downward (toward the large plate 68). The third mounting base 84 has, on its top surface, one mounting hole (screw hole) 84a for mounting the battery pack 64, and three mounting holes (screw holes) 84b, 84c, and 84d for mounting the floor frame and hydraulic oil tank. However, the third mounting base 84 is not limited to this configuration.

[0034] As an example, the fourth mounting base 86 includes an upper plate 86A attached to the protrusion 74b of the vertical rib 74, and a lower plate 86B that is generally L-shaped in plan view and supports the upper plate 86A from below. The fourth mounting base 86 (upper plate 86A) has, on its upper surface, one mounting hole (screw hole) 86a for mounting the battery pack 64, and two mounting holes (screw holes) 86b, 86c for mounting the floor frame. The fourth mounting base 86 also includes a second counterweight mounting portion 94 for mounting the counterweight 20. The second counterweight mounting portion 94 has one mounting hole (screw hole) 94a. However, the fourth mounting base 86 is not limited to this configuration.

[0035] 6A and 6B, the mounting bases 82, 86 are attached to the large plate 68 so as to cross the front portions of the lashing point reinforcements 88, 90. In other words, the lashing point reinforcements 88, 90 are sandwiched between the large plate 68 and the mounting bases 82, 86. This prevents the large plate 68 from bending or breaking due to the tension of the lashing members.

[0036] The battery pack 64 is equipped with brackets (not shown) protruding from both the left and right side surfaces. The battery pack 64 is attached to the vertical ribs 72, 74 (main body frame 18) by fixing the brackets to the above-mentioned mounting bases 80 (mounting hole 80a), 82 (mounting hole 82a), 84 (mounting hole 84a), and 86 (mounting hole 86a) using vibration-isolating rubber mounts (not shown) and fixing members (not shown). The mounting bases 80, 82, 84, and 86 are firmly fixed to the vertical ribs 72 and 74 by welding, so that the large and heavy battery pack 64 can be supported.

[0037] The battery pack 64 attached to the main body frame 18 is located above the notch 70. The notch 70 is formed so that at least a portion of the battery pack 64 that is forward of the center of gravity is exposed in a bottom view. This allows the support portion (claws in the case of a forklift) of a material handling and transporting device such as a forklift to enter from the rear of the vehicle body and carry the battery pack 64 in and out. In other words, the battery pack 64 can be easily attached and detached.

[0038] The counterweight 20 is attached to the vertical ribs 72, 74 (main body frame 18) by being fixed to the counterweight mounting portions 92 (mounting holes 92a) and 94 (mounting holes 94a) with fixing members (bolts, for example) 104. This connects the counterweight 20 to the vertical ribs 72, 74, and allows it to function not only as a weight balance adjustment member but also as a cross beam of the car body (upper body 3), thereby increasing the strength of the car body (upper body 3). The counterweight 20 is also attached to the large plate 68 (main body frame 18) by being fixed to the third counterweight mounting portion 96 (mounting hole 96a) and the fourth counterweight mounting portion 98 (mounting hole 98a) provided on the large plate 68 with fixing members 104.

[0039] The counterweight 20 is fixed to three locations, the counterweight mounting portions 92, 94, and 96, by inserting a fixing member 104 from above. The counterweight 20 is fixed to one location, the counterweight mounting portion 98, by inserting a fixing member 104 from below. In conventional work vehicles, the counterweight is fixed at multiple locations (e.g., two locations) from above and multiple locations (e.g., two locations) from below. In contrast, by limiting fixing from below to one location, as in this embodiment, the effort of accessing the lower mounting portion can be eliminated.

[0040] As described above, according to the present invention, it is possible to provide a work vehicle that simplifies the rear structure of the vehicle body (upper body 3) while ensuring the strength of the vehicle body so that heavy loads can be carried.

[0041] Although a work vehicle using an electric motor as a drive source has been given as an example of the work vehicle 1, the present invention is not limited to this example and can also be applied to work vehicles using an engine (internal combustion engine) as a drive source. In particular, the vehicle can be configured to carry other devices besides the battery pack, an additional counterweight, etc., at the rear of the vehicle body.

[0042] The present invention is not limited to the above example (hydraulic excavator), but can be similarly applied to other work vehicles (for example, track loaders, carriers, etc.). [Explanation of symbols]

[0043] 1. Work vehicles 2 Lower body 3. Upper body 10 Running gear 12, 14 Work equipment 18 Main frame 20 Counterweight 64 Battery Pack 68 large board 70 Notch 72, 74 Vertical ribs 76 Horizontal rib 78, 79 Securing points 80, 82, 84, 86 Mounting base 88, 90 Fastening point reinforcement members 92, 94, 96, 98 Counterweight mounting points

Claims

1. A work vehicle comprising a vehicle body, a traveling device, a hydraulically operated working device, and a drive source for the traveling device or the working device, The vehicle body includes a main body frame at its lower portion, which is a strength member and a support member for mounted equipment, The main body frame has a large plate serving as a bottom plate, a pair of left and right vertical ribs erected on the large plate, and a horizontal rib erected on the large plate, the large plate has a notch at the rear portion thereof that is cut out so as to open rearward in a plan view, The vertical ribs are provided along the left and right edges of the notch at intervals in the left-right direction toward the rear, The horizontal rib intersects with the vertical rib and stands along the front edge of the notch, The large plate has fastening points at the left and right rear end portions spaced apart from each other across the notch, A fastening point reinforcement member is fixed on the fastening point, The fastening point reinforcement member is sandwiched between the large plate and a base on which the counterweight is attached, The base on which the counterweight is attached is arranged so as to intersect with the securing point reinforcement member. A work vehicle characterized by:

2. The counterweight is fixed to the rear of the longitudinal rib by a fixing member, The counterweight is configured to serve both as a weight balance adjustment member for the vehicle body and as a cross beam for the main body frame.

2. The work vehicle according to claim 1,

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