construction machinery

Abstract

Problem: Provided is a construction machine capable of preventing damage to a battery placed on a main frame of the machine. Solution: A construction machine includes a main frame (22), a support plate (54) mounted on the main frame (22) via an elastic fixing member (42), and a battery (26) fixed to the top side of the support plate (54). No welding is performed on the support plate (54).

Description

Technical Field

[0001] The present invention relates to a construction machine capable of preventing a battery placed on a main frame of the machine from being damaged. Background Art

[0002] In recent years, due to environmental and workplace constraints, there has been an increasing demand for construction machinery (such as hydraulic excavators) equipped with hybrid power sources, including an engine and an electric motor, and electrically driven construction machinery equipped with an electric motor. In electrically driven construction machinery, power is supplied to the electric motor using a cable from a commercial power source or from a battery mounted on the main frame of the electrically driven construction machinery (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-202065 Summary of the Invention

[0006] [Problems to be solved by the present invention]

[0007] However, since the mechanical main frame that holds the batteries is formed by welding metal materials (such as steel plates), the portion where the batteries are held may be deformed by welding. In this case, when the batteries are fixed to the mechanical main frame, local high stress is generated in the batteries, posing a risk of battery damage.

[0008] The present invention has been made in view of the above circumstances and aims to provide a construction machine capable of preventing damage to a battery placed on a main frame of the machine.

[0009] [Solution to the problem]

[0010] To solve the above problems, the present invention provides a construction machine comprising a machine body frame, a support plate mounted on the machine body frame via elastic fixing members, and a battery fixed to the top side of the support plate, wherein no welding is performed on the support plate.

[0011] Preferably, a shelf having a plurality of shelves spaced apart in the vertical direction is mounted on the rear end portion of the main frame of the machine, and a plurality of support plates are provided via elastic fixings and mounted on the respective top sides of the plurality of shelves. The shelf is preferably mounted on the rear end portion of the main frame of the machine via additional elastic fixings. It is convenient to include a cover member covering the upper, rear and side portions of the shelf. The base plate is preferably fixed to the rear end portion of the main frame of the machine, and the support plates are mounted on the top side of the base plate via elastic fixings. In addition, electrical components other than the battery are preferably fixed to the top side of the support plate.

[0012] [Beneficial effects of the present invention]

[0013] In the construction machine of the present invention, the support plate that secures the battery is attached to the machine's main frame via elastic fasteners. Therefore, even if the machine's main frame deforms due to welding, the elastic fasteners located between the main frame and the support plate minimize the impact of the deformation on the support plate. Furthermore, since welding is not performed on the support plate that supports the battery, welding-induced deformation of the support plate is avoided. Therefore, the construction machine of the present invention can suppress the generation of localized high stress in the battery and prevent battery damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a side view of an electrically driven hydraulic excavator configured in accordance with the present invention.

[0015] Figure 2 (a) is a shelf and Figure 1 A perspective view of the mechanical main frame is shown, Figure 2 (b) Yes Figure 2 (a) Exploded perspective view of the machine body frame and shelves shown.

[0016] Figure 3 (a) Yes Figure 2 a perspective view of the shelving unit shown; Figure 3 (b) shows that the battery is housed in Figure 3 (a) A perspective view of the state in the shelf shown.

[0017] Figure 4 (a) The shelf is fixed to the elastic fixing part Figure 2 A partial perspective view of the shelf in the illustrated state; Figure 4 (b) The shelf is in the position where the support plate is installed Figure 4 (a) A partial perspective view of the state on the elastic fixing member shown; Figure 4 (c) The shelf is in the position where the battery is fixed to Figure 4 (b) is a partial perspective view of the state of the support plate shown.

[0018] Figure 5It is a partially exploded perspective view of an electrically driven hydraulic excavator, in which a rack is mounted on the machine body frame via additional elastic fixing parts.

[0019] Figure 6 It is a perspective view of an electrically driven hydraulic excavator viewed from the rear, in which a support plate on which a battery is fixed is mounted on a base plate fixed to a main body frame of the machine. DETAILED DESCRIPTION

[0020] Hereinafter, taking an electrically driven hydraulic excavator provided with an electric motor as a driving source as an example, preferred embodiments of a construction machine configured according to the present invention will be described with reference to the accompanying drawings.

[0021] When referring to Figure 1 For description, the electrically driven hydraulic excavator indicated by reference numeral 2 as a whole includes a lower travel structure 4 , an upper rotating structure 6 rotatably supported by the lower travel structure 4 , and a working arm device 8 mounted on the upper rotating structure 6 .

[0022] The working arm assembly 8 includes a boom 10 (whose base end is connected to the upper rotating structure 6), an arm 12 (whose base end is connected to the distal end of the boom 10), a bucket 14 connected to the distal end of the arm 12, an arm cylinder 16 for swinging the boom 10 relative to the upper rotating structure 6, an arm cylinder 18 for swinging the arm 12 relative to the boom 10, and a bucket cylinder 20 for swinging the bucket 14 relative to the arm 12. Then, in the electrically-driven hydraulic excavator 2, various works (e.g., excavation work) are adapted to be performed by swinging the boom 10, arm 12, and bucket 14 of the working arm assembly 8 by the respective cylinders 16, 18, and 20.

[0023] Mounted on a frame 22 of the upper rotating structure 6 (hereinafter referred to as the "machine body frame 22") are a cab 24, an electric motor (not shown) serving as a drive source, and a hydraulic pump (not shown) connected to the motor's output shaft. The machine body frame 22 is formed by welding suitable metal materials (e.g., steel plates). In the electrically driven hydraulic excavator 2, the hydraulic pump is driven by the electric motor, allowing high-pressure hydraulic oil to be supplied from the hydraulic pump to hydraulic actuators (e.g., the boom cylinder 16).

[0024] like Figure 2 As shown, a rack 28 for accommodating a plurality of batteries 26 for supplying power to the motor is arranged at the rear end portion of the machine body frame 22. As the battery 26, for example, a lithium ion battery can be used. Figure 3In description, the shelf 28, which can be formed by welding a suitable metal material (e.g., steel material), includes a top plate 30 extending substantially horizontally, a plurality of (four in the illustrated embodiment) shelves 32 spaced apart in the vertical direction below the top plate 30, and a connecting member 34 for connecting the top plate 30 and the plurality of shelves 32. The respective shelves 32 are arranged substantially horizontally, and the lowermost shelf 32 is fixed to the rear end portion of the machine main frame 22 (see FIG. 2 ) by a plurality of bolts 36. Figure 2 (b)).

[0025] like Figure 3 As shown, the connecting member 34 of the illustrated embodiment has a pair of side plates 38 extending downward from both ends in the width direction of the top plate 30, and a plurality of (8 in the illustrated embodiment) partition plates 40 arranged between the top plate 30 and the shelf 32 and between adjacent shelves 32 in the vertical direction between the pair of side plates 38. One side plate 38 is welded to one end in the width direction of the top plate 30 and one end in the width direction of the corresponding shelf 32, and the other side plate 38 is welded to the other end in the width direction of the top plate 30 and the other end in the width direction of the corresponding shelf 32. As shown by referring to Figure 3 It is understood that the lower end of the corresponding partition 40 is welded to the top side of the shelf 32 , and the upper end of the corresponding partition 40 is welded to the underside of the top plate 30 or the underside of the shelf 32 .

[0026] When referring to Figure 4 (a) As described, a plurality of elastic fixing members 42 are fixed to the top sides of the corresponding shelves 32. The elastic fixing members 42 can have a known configuration, but the elastic fixing members 42 of the illustrated embodiment include a diamond-shaped lower plate 46 made of metal fixed to the top side of the shelf 32 with bolts 44, a cylindrical rubber 48 anchored to the top side of the lower plate 46, and a diamond-shaped upper plate 50 made of metal anchored to the top side of the rubber 48. Nuts 52 are welded to the underside of the upper plate 50.

[0027] like Figure 4 As shown in (b), rectangular support plates 54 are arranged approximately horizontally above the corresponding shelf 32, and each support plate 54 is mounted to the elastic fixing member 42 by tightening the bolt 56 and nut 52 of the elastic fixing member 42. That is, a plurality of support plates 54 are provided and mounted on the corresponding top side of the shelf 32 via the elastic fixing member 42. The respective support plates 54 are formed of a suitable metal material (e.g., steel plate). On the support plates 54, drilling for forming holes for the bolts 56 to pass through and tapping for forming internal threads are performed, but no welding is performed.

[0028] If by reference Figure 4(c) It will be appreciated that, in the illustrated embodiment, a plurality of batteries 26 are fixed to the top sides of the respective support plates 54 by bolts 58. The number of batteries 26 to be fixed to the respective support plates 54 may be one. Furthermore, the fixing of the batteries 26 to the support plates 54 is not limited to the bolts 58, and although not illustrated, for example, a recess may be formed on the side surface of the battery 26, and a fixing member having a protrusion configured to fit into the recess of the battery 26 may be adapted to be attached to the support plate 54.

[0029] As shown in the illustrated embodiment, when multiple batteries 26 are fixed to a single sheet of support plate 54, each interval between adjacent batteries 26 can be smaller than when a single battery 26 is fixed to a single support plate 54. Therefore, multiple batteries 26 are preferably fixed to a single support plate 54. When a single battery 26 is fixed to a single support plate 54, for example, when the battery 26 swings relative to the shelf 32 due to vibrations generated when the electrically driven hydraulic excavator 2 travels, the multiple batteries 26 will each perform different movements. To this end, it is necessary to make the intervals between adjacent batteries 26 relatively large to prevent adjacent batteries 26 from interfering with each other. On the other hand, when multiple batteries 26 are fixed to a single sheet of support plate 54, the batteries 26 fixed to the same support plate 54 perform the same movement, so that adjacent batteries 26 do not interfere with each other. Therefore, the intervals between adjacent batteries 26 can be relatively small.

[0030] Any electrical components other than the battery 26 may be secured to the top side of the support plate 54. In the embodiment shown, Figure 3 As shown in FIG. 5( b ), battery disconnect units 60 are fixed to the top side of support plate 54. Each battery disconnect unit 60 includes a contactor, a fuse, a current measuring instrument, and a device for acquiring information from battery 26 (e.g., battery temperature and voltage of battery 26) (all not shown).

[0031] like Figure 1 As shown, a cover member 62 covering the upper, rear, and side portions of the shelf 28 is mounted to the machine body frame 22. The cover member 62, which may be formed of a suitable metal material, may be provided with a door or the like and may be configured to allow access to the batteries 26 or the like housed in the shelf 28 by opening the door during maintenance.

[0032] In the electrically driven hydraulic excavator 2 configured as described above, since the support plates 54 that secure the batteries 26 are attached to the corresponding shelves 32 of the rack 28 via the elastic fixing members 42, even if the shelves 32 are deformed by welding, the elastic fixing members 42 located between the shelves 32 and the support plates 54 reduce the effect of the deformation of the shelves 32 on the support plates 54. Furthermore, since welding is not performed on the support plates 54 that support the batteries 26, deformation due to welding is not caused on the support plates 54. Therefore, in the electrically driven hydraulic excavator 2, damage to the batteries 26 can be prevented by suppressing the generation of localized high stress on the batteries 26.

[0033] Furthermore, in the electrically driven hydraulic excavator 2 , since vibration generated during traveling or the like is reduced by the elastic mount 42 , malfunction or internal damage of the battery 26 due to vibration exceeding the allowable value of the battery 26 can be prevented.

[0034] like Figure 2 As shown, when assembling the electric drive hydraulic excavator 2, by preparing in advance the battery 26 attached to the battery rack assembly 28 (see Figure 3 (b)), and by fixing the battery shelf assembly to the rear end portion of the machine body frame 22, a plurality of batteries 26 can be easily mounted on the machine body frame 22.

[0035] The shelf 28 is fixed to the rear end of the machine body frame 22 by bolts 36, but Figure 5 As shown, the shelf 28 can be mounted on the rear end of the machine body frame 22 via additional elastic fixing members 64. Figure 5 In the example shown, a retaining plate 66 for retaining a plurality of additional elastic fixing members 64 is fixed to the rear end of the machine main frame 22 by means of bolts 68, and the lowermost shelf 32 of the shelf 28 is fixed to the additional elastic fixing member 64 by means of bolts 70, so that the shelf 28 is mounted on the rear end of the machine main frame 22 via the additional elastic fixing member 64. Figure 5 In the example shown, the vibrations transmitted to the battery 26 are further reduced by an additional elastic fixing 64. As the additional elastic fixing 64, for example, a liquid-filled adhesive fixing can be used.

[0036] In the illustrated embodiment, an example has been described in which the support plate 54 is mounted on the top side of the shelf 32 via the elastic fixing member 42, and the shelf 28 and the elastic fixing member 42 are inserted between the machine body frame 22 and the support plate 54. However, in the present invention, only the elastic fixing member 42 may be configured to be inserted between the machine body frame 22 and the support plate 54.

[0037] Alternatively, as Figure 6As shown, one or more base plates 72 can be fixed to the rear end of the machine body frame 22 via bolts 74, and the support plate 54 can be mounted on the top side of the base plates 72 via the elastic fixing members 42. In other words, the base plates 72 and the elastic fixing members 42 can be inserted between the machine body frame 22 and the support plate 54. The base plates 72 can be drilled and tapped, and can also be welded. The shelf 28, in which the plurality of batteries 26 are mounted, can be arranged above the base plates 72.

[0038] In addition, also in Figure 6 In the illustrated example, damage to the battery 26 is prevented by suppressing the generation of localized high stress in the battery 26, and malfunction or internal damage to the battery 26 due to vibration exceeding the permissible limit of the battery 26 can be prevented. Furthermore, by preparing a battery substrate assembly in which a plurality of batteries 26 are attached to the substrate 72 and securing the battery substrate assembly to the rear end portion of the machine body frame 22, the plurality of batteries 26 can be easily mounted on the machine body frame 22.

[0039] In the illustrated embodiment, although the present invention is described as being applied to an electrically driven hydraulic excavator, the application of the present invention is not limited to electrically driven construction machinery, and the present invention may also be applied to a hybrid construction machinery including an engine and an electric motor as drive sources.

Claims

1. A construction machine comprising a machine main frame; a shelf having a plurality of shelves spaced apart in the vertical direction, the shelf being formed by welding and being mounted on the rear end portion of the machine body frame; a plurality of support plates provided via elastic fixings and mounted on corresponding shelves of the plurality of shelves, and The battery is fixed to the top side of the support plate, wherein no welding is performed on the support plate, thereby not causing deformation at the support plate due to welding; and wherein the shelf is mounted on the rear end portion of the machine body frame via additional elastic fixings. 2 . The construction machine according to claim 1 , comprising a cover member covering an upper portion, a rear portion, and a side portion of the shelf. 3 . The construction machine according to claim 1 , wherein electric components other than the battery are also fixed to the top side of the support plate.

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