Work vehicle

Abstract

To provide a work vehicle capable of effectively utilizing the space of a device storage room.SOLUTION: A work vehicle 1 comprises a hydraulic pump 66, an electric motor 62 that drives the hydraulic pump 66, and a device housing chamber 59 that houses the hydraulic pump 66 and the electric motor 62. An output shaft of the electric motor 62 is connected to an input shaft of the hydraulic pump 66. The electric motor 62 is disposed either above or below the hydraulic pump 66.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] BACKGROUND ART In the field of work vehicles such as construction machinery, electric work vehicles that use an electric motor as a drive source to perform work and travel are becoming increasingly common. Electric work vehicles are equipped with an electric motor.

[0003] Fig. 5 is a diagram showing the arrangement of equipment arranged inside an equipment storage compartment (engine room) 960 in the work vehicle described in Patent Document 1. Note that in Fig. 5, the cover of the equipment storage compartment 960 is omitted.

[0004] In the work vehicle described in Patent Document 1, an electric motor 962, a hydraulic pump 966, a first electrical component EC1 (a charger 961, an inverter 963, a DC-DC converter 965), and a second electrical component EC2 are arranged in an equipment housing chamber 960 located on a revolving frame 920 of an upper revolving body. Also arranged in the equipment housing chamber 960 is a battery unit 970 that stores power for driving the electric motor 962.

[0005] An output shaft (not shown) of the electric motor 962 is connected to an input shaft (not shown) of the hydraulic pump 966. As shown in Fig. 5, the electric motor 962 and the hydraulic pump 966 are arranged side by side in the left-right direction of the work vehicle on top of the battery unit 970. The first electrical component EC1 and the second electrical component EC2 are also arranged on top of the battery unit 970.

[0006] According to Patent Document 1, it is possible to provide a work vehicle that can maintain good balance of the vehicle body even when a large-capacity (large) battery unit 970 is used. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-81617 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the arrangement of the equipment in the equipment storage compartment of the work vehicle described in Patent Document 1, particularly the arrangement of the electric motor and hydraulic pump, is not an effective use of the space in the equipment storage compartment. In particular, when the work vehicle is a small work vehicle, the length of the equipment storage compartment in the front-to-rear and left-to-right directions is limited. Therefore, when attempting to connect the electric motor and hydraulic pump and arrange them in the equipment storage compartment so that the output shaft of the electric motor is horizontal, there is a problem in that it may not be possible to accommodate them in the equipment storage compartment.

[0009] The present invention has been made in view of the above-mentioned problems, and has an object to provide a work vehicle that can effectively utilize the space in the equipment storage compartment. [Means for solving the problem]

[0010] [1] The work vehicle disclosed herein includes a hydraulic pump, an electric motor that drives the hydraulic pump, and an equipment housing that houses the hydraulic pump and the electric motor. The output shaft of the electric motor is connected to the input shaft of the hydraulic pump. The electric motor is disposed either above or below the hydraulic pump.

[0011] [2] In the work vehicle disclosed herein, it is preferable that the electric motor be disposed above the hydraulic pump.

[0012] [3] The work vehicle of the present disclosure further includes a bracket on which the electric motor is mounted. Preferably, the electric motor is mounted on the bracket.

[0013] [4] The work vehicle of the present disclosure may further include an inverter that controls the electric motor. Preferably, the inverter is mounted on the bracket.

[0014] [5] In the work vehicle of the present disclosure, the hydraulic pump includes a plurality of hydraulic pumps, and the plurality of hydraulic pumps are preferably connected in series. [Effects of the Invention]

[0015] The work vehicle of the present invention includes a hydraulic pump, an electric motor, and an equipment housing that houses the hydraulic pump and the electric motor. The output shaft of the electric motor is connected to the input shaft of the hydraulic pump. The electric motor is disposed either above or below the hydraulic pump.

[0016] Here, the size of the electric motor-hydraulic pump connection unit that connects the electric motor and hydraulic pump when the electric motor and hydraulic pump are connected depends on the type of electric motor and hydraulic pump used, but is usually longest in the direction in which the output shaft of the electric motor and the input shaft of the hydraulic pump (hereinafter, the "output shaft of the electric motor and the input shaft of the hydraulic pump" may be referred to as the "rotating shaft").

[0017] Therefore, when the length of the equipment storage compartment is limited in the left-right or front-rear direction, the electric motor-hydraulic pump connection unit can be accommodated in the equipment storage compartment by arranging the longest rotating shaft in the vertical direction of the work vehicle. In other words, the present invention makes it possible to provide a work vehicle that can effectively utilize the vertical space in the equipment storage compartment. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram shown to explain a work vehicle 1 according to an embodiment, and is an external perspective view of the work vehicle 1 as seen obliquely from the front. [Figure 2]FIG. 2 is a diagram shown to explain the work vehicle 1 according to the embodiment, and is an external perspective view of the work vehicle 1 as seen obliquely from the rear. [Figure 3] FIG. 3 is a view of the equipment storage compartment 59 as seen from the front, for explaining the equipment storage compartment 59 of the work vehicle 1 according to the embodiment. [Figure 4] FIG. 4 is a view of the equipment storage compartment 59 as seen obliquely from the front, for explaining the equipment storage compartment 59 of the work vehicle 1 according to the embodiment. [Figure 5] FIG. 5 is a diagram shown for explaining the work vehicle described in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, modes for carrying out the present invention (hereinafter referred to as "embodiments") will be described. The embodiments described below show preferred modes for carrying out the invention, and do not limit the invention according to the claims. Furthermore, not all of the elements and combinations thereof described in the embodiments are necessarily essential to the present invention.

[0020] 1. Work vehicles A work vehicle 1 according to an embodiment of the present invention will be described below with reference to the drawings. In the embodiment shown below, a crawler hydraulic excavator will be described as an example of the work vehicle 1. First, the external configuration of the work vehicle 1 according to the embodiment will be described with reference to Figs. 1 and 2. Note that the external configuration of the work vehicle 1 according to the embodiment is not the gist of the present invention, so only a general description will be given. Furthermore, in each drawing used to explain the embodiment, components having the same function are given the same reference numerals, and redundant description may be omitted.

[0021] Furthermore, when it is necessary to indicate the left and right, front and rear, and top and bottom of the work vehicle 1 when explaining the work vehicle 1 according to the embodiment, the side of the work vehicle 1 on which the blade 30 is attached will be referred to as the "front", and the side opposite to the side on which the blade 30 is attached will be referred to as the "rear". Furthermore, the left side of the work vehicle 1 when viewed from behind will be referred to as the "left", and the right side of the work vehicle 1 when viewed from behind will be referred to as the "right". Furthermore, the bottom side of the work vehicle 1 will be referred to as the "bottom", and the side opposite the bottom will be referred to as the "top".

[0022] Fig. 1 is a diagram shown to explain a work vehicle 1 according to an embodiment, and is an external perspective view of the work vehicle 1 as seen diagonally from the front. Fig. 2 is a diagram shown to explain a work vehicle 1 according to an embodiment, and is an external perspective view of the work vehicle 1 as seen diagonally from the rear. Figs. 1 and 2 are external perspective views in which the left side of the work vehicle 1 can be seen.

[0023] As shown in Figures 1 and 2, the work vehicle 1 comprises a lower running body 10, an upper rotating body 20 rotatably mounted on the upper part of the lower running body 10, a blade 30 mounted on the front part of the lower running body 10, and a work device 40 mounted on the front part of the upper rotating body 20.

[0024] The lower traveling body 10 has a pair of left and right crawlers 12 on both the left and right sides of a frame 11. A blade 30 that is capable of swinging up and down is attached to the frame 11. A swivel mechanism (not shown) is provided at approximately the center of the upper part of the frame 11. The swivel mechanism allows the upper rotating body 20 to rotate on a horizontal plane. The lower traveling body 10, upper rotating body 20, blade 30, and working device 40 are each driven by a corresponding hydraulic actuator (hydraulic motor, hydraulic cylinder, etc.).

[0025] The upper surface, rear surface, left side surface, right side surface, and front surface of the upper rotating body 20 are each covered by a cover. The area covered by the covers constitutes an equipment storage room 59 (see FIG. 3). Here, the covers covering the upper surface and rear surface of the equipment storage room 59 are referred to as a battery cover 22 (see FIG. 2), and the covers covering the left surface, right surface, and front surface are referred to as a left side surface cover 23, a right side surface cover 24 (see FIG. 2), and a front surface cover 25 (see FIG. 1), respectively. The equipment storage room 59 is constituted as an area surrounded by the battery cover 22, the left side surface cover 23, the right side surface cover 24, and the front surface cover 25.

[0026] A canopy-type operator's cab 50 is provided above the equipment storage room 59. The operator's cab 50 is provided with a canopy pole 51, an operator's seat 52, and an operating lever 53. In addition, a counterweight 29 (see FIG. 2) that forms part of the rear surface is provided below the rear surface of the upper rotating body 20.

[0027] 2. Equipment housing and arrangement of equipment within the equipment housing Fig. 3 is a view of the equipment storage compartment 59 of the work vehicle 1 according to the embodiment as seen from the front to explain the equipment storage compartment 59. Fig. 4 is a perspective view of the equipment storage compartment 59 of the work vehicle 1 according to the embodiment as seen obliquely from the front.

[0028] As described above, the equipment storage compartment 59 is formed as an area surrounded by the battery cover 22 (see FIG. 2), the left side cover 23 (see FIGS. 1 and 2), the right side cover 24 (see FIG. 2), and the front cover 25 (see FIG. 1) of the upper rotating body 20. Note that FIG. 3 shows a cross section of a portion of the left side cover 23 and the right side cover 24 among these covers. In FIG. 4, these covers are not shown.

[0029] The right side cover 24 is provided with an intake port 26 for letting in air as cooling air, and the left side cover 23 is provided with an exhaust port 27 for discharging the cooling air.

[0030] 3 and 4, the equipment housing chamber 59 houses equipment such as an on-board charger 61, an electric motor 62, an inverter 63, a hydraulic pump 66, and a battery unit 70. The equipment housing chamber 59 also houses hydraulic piping, electrical wiring, etc. Note that the hydraulic piping and electrical wiring are not shown in FIGS. 3 and 4.

[0031] The electric motor 62 is disposed so that its output shaft extends downward (see FIG. 3). The electric motor 62 is placed on a horizontal plate 91 of a third bracket 90. The output shaft passes through the horizontal plate 91 and extends downward from the horizontal plate 91. The output shaft extending below the horizontal plate 91 is connected to the input shaft of the hydraulic pump 66. The third bracket 90 and the horizontal plate 91 will be described later.

[0032] As shown in FIGS. 3 and 4, the work vehicle 1 according to this embodiment has three hydraulic pumps 66a, 66b, and 66c as the plurality of hydraulic pumps.

[0033] Each of the hydraulic pumps 66a, 66b, and 66c is connected to a hydraulic oil tank (not shown) that contains pressurized oil (hydraulic oil). Each of the hydraulic pumps 66a, 66b, and 66c supplies hydraulic oil from the hydraulic oil tank to a hydraulic actuator via a control valve (not shown). The pressurized oil supplied to the hydraulic actuator operates the lower traveling body 10, the upper rotating body 20, the blade 30, and the work device 40.

[0034] The number of hydraulic pumps 66 provided on the work vehicle 1 is not limited to three. The number of hydraulic pumps 66 can be set to an appropriate number depending on the number of hydraulic actuators provided on the work vehicle 1.

[0035] The multiple hydraulic pumps 66a, 66b, 66c are connected in series as shown in Figures 3 and 4. The multiple hydraulic pumps 66a, 66b, 66c are also arranged side by side in the vertical direction of the work vehicle 1.

[0036] The electric motor 62 is disposed either above or below the hydraulic pump 66. Here, the size of the electric motor-hydraulic pump connection unit depends on the types of electric motor 62 and hydraulic pump 66 used, but typically, the length in the direction in which the output shaft of the electric motor 62 and the input shaft of the hydraulic pump 66 (hereinafter, the "output shaft of the electric motor 62 and the input shaft of the hydraulic pump 66" may be referred to as the "rotation shaft 621") extends is the longest.

[0037] When the left-right length or the front-rear length of the equipment storage compartment 59 is limited, the electric motor-hydraulic pump connection unit can be accommodated within the equipment storage compartment 59 by arranging the longest rotating shaft 621 in the vertical direction of the work vehicle 1. In other words, according to the present invention, it is possible to provide a work vehicle 1 that can effectively utilize the vertical space of the equipment storage compartment 59.

[0038] In particular, when the work vehicle 1 is a small work vehicle, there are often limitations on the length of the equipment storage compartment 59 in the front-to-rear and left-to-right directions. Even in such cases, by arranging the rotating shaft 621 of the electric motor 62 so that it is oriented in the vertical direction relative to the work vehicle 1, the rotating shaft 621 of the electric motor 62 can be stored in the equipment storage compartment 59 while remaining connected to the hydraulic pump 66.

[0039] In the work vehicle 1, the electric motor 62 is disposed above the hydraulic pump 66 in the equipment storage compartment 59. According to the work vehicle 1 according to this embodiment, it is possible to prevent the electric motor 62 from becoming dirty with oil adhering to the hydraulic pump 66 or hydraulic piping (not shown).

[0040] The inverter 63 is a device that converts direct current supplied from the battery unit 70 into alternating current and supplies the alternating current to the electric motor 62. As shown in FIGS. 3 and 4, the inverter 63 is placed on the horizontal plate 91 of the third bracket 90.

[0041] The on-board charger 61 converts AC current supplied from a commercial power source via a power supply cable (not shown) into DC current.

[0042] The oil cooler 64 is a cooling device that cools the hydraulic oil that drives the hydraulic actuator.

[0043] Cooling fan 65 circulates cooling air through on-board charger 61, electric motor 62, inverter 63, and oil cooler 64 in this order from the upstream side of the cooling air. In work vehicle 1 according to this embodiment, cooling fan 65 is attached to oil cooler 64. For this reason, cooling fan 65 is shown in FIG. 3 as having a structure that is integrated with oil cooler 64.

[0044] The battery unit 70 is configured, for example, by a lithium-ion battery unit. The battery unit 70 stores power for driving the electric motor 62. The battery unit 70 may be configured by unitizing a plurality of battery cells, or may be configured by a single battery cell. It is preferable that the battery unit 70 be configured by unitizing a plurality of battery cells and housing them in a single case.

[0045] The upper revolving body 20 is provided with a power feed port 55. The power feed port 55 is connected to a commercial power source, which is an external power source, via a power feed cable. This allows the battery unit 70 to be charged.

[0046] The work vehicle 1 has brackets for mounting equipment inside the equipment storage compartment 59. Examples of brackets include a bracket (first bracket 81) for mounting the on-board charger 61, a bracket (second bracket 82) for mounting the oil cooler 64, and a bracket (third bracket 90) for mounting the electric motor 62 and inverter 63. These brackets are attached to the top of the main body frame 28 by fastening means such as bolts.

[0047] The electric motor 62 and the inverter 63 are disposed on a third bracket 90. As shown in Fig. 4, the third bracket 90 is integrally formed of a horizontal plate 91 extending forward, a horizontal plate 92 (referred to as an auxiliary horizontal plate 92) extending rearward, and a vertical plate 93 interposed between the horizontal plate 91 and the auxiliary horizontal plate 92.

[0048] The electric motor 62 is mounted on the third bracket 90. That is, the electric motor 62 is accommodated in an upper region 60a formed above the third bracket 90 within the space 60 of the equipment housing chamber 59. On the other hand, the hydraulic pump 66 is accommodated in a lower region 60b formed below the third bracket 90 within the space 60 of the equipment housing chamber 59.

[0049] That is, the electric motor 62 housed in the upper region 60a and the hydraulic pump 66 housed in the lower region 60b are disposed with the third bracket 90 interposed therebetween. This makes it possible to more effectively prevent oil adhering to the hydraulic pump 66 from adhering to the electric motor 62 in the event of an oil leak in the hydraulic pump 66. As a result, the reliability of the electric motor 62 can be improved.

[0050] The horizontal plate 91 is provided with a through-hole (not shown) for passing the rotary shaft 621 of the electric motor 62 therethrough. This makes it possible to connect the output shaft of the electric motor 62 to the input shaft of the hydraulic pump 66, while preventing oil adhering to the hydraulic pump 66 from adhering to the electric motor 62.

[0051] The inverter 63 is mounted on a horizontal plate 91 of a third bracket 90, as shown in FIGS.

[0052] By placing the inverter 63 on the third bracket 90, the inverter 63 is accommodated in the same upper region 60a as the electric motor 62. This makes it possible to prevent oil adhering to the hydraulic pump 66 from adhering to the inverter 63. As a result, the reliability of the inverter 63 can be improved.

[0053] In addition, by placing the electric motor 62 and the inverter 63 on the third bracket 90 and assembling the hydraulic pump 66 below the third bracket 90, the electric motor 62, the inverter 63 and the hydraulic pump 66 can be assembled into an assembly.

[0054] The electrical wiring between the electric motor 62 and the inverter 63 is connected in advance. The assembly in this state is mounted on the work vehicle 1, and the hydraulic piping to the hydraulic pump 66 and the electrical wiring from the inverter 63 to the battery unit 70 are connected. This improves the ease of assembly to the work vehicle 1.

[0055] The effects achieved by the work vehicle 1 according to this embodiment will be described below.

[0056] [1] The work vehicle 1 according to this embodiment includes a hydraulic pump 66, an electric motor 62, and an equipment housing chamber 59 that houses the hydraulic pump 66 and the electric motor 62. The output shaft of the electric motor 62 is connected to the input shaft of the hydraulic pump 66. The electric motor 62 is also disposed either above or below the hydraulic pump 66.

[0057] Here, the size of the electric motor-hydraulic pump connection unit formed by connecting the electric motor 62 and the hydraulic pump 66 depends on the type of electric motor 62 and hydraulic pump 66 used, but is usually longest in the direction in which the rotating shaft 621 extends.

[0058] Therefore, when the left-right length or the front-rear length of the equipment storage compartment 59 is limited, the electric motor-hydraulic pump connection unit can be accommodated within the equipment storage compartment 59 by arranging the electric motor-hydraulic pump connection unit so that the direction of the longest rotation shaft 621 is in the vertical direction of the work vehicle 1. In other words, with the work vehicle 1 according to this embodiment, the vertical space of the equipment storage compartment 59 can be effectively utilized.

[0059] [2] In a preferred aspect of the work vehicle 1 according to this embodiment, the electric motor 62 is disposed above the hydraulic pump 66 in the equipment housing compartment 59. This makes it possible to prevent the electric motor 62 from becoming contaminated by oil adhering to the hydraulic pump 66 or hydraulic piping (not shown).

[0060] [3] In a preferred embodiment, the work vehicle 1 according to the present embodiment further includes a third bracket 90 on which the electric motor 62 is mounted.

[0061] The electric motor 62 is accommodated in an upper region 60a formed above the third bracket 90 within the space 60 of the equipment housing chamber 59. Meanwhile, the hydraulic pump 66 is accommodated in a lower region 60b formed below the third bracket 90 within the space 60 of the equipment housing chamber 59. That is, the electric motor 62 accommodated in the upper region 60a and the hydraulic pump 66 accommodated in the lower region 60b are disposed with the third bracket 90 interposed therebetween. This more effectively prevents oil adhering to the hydraulic pump 66 from adhering to the electric motor 62. As a result, the reliability of the electric motor 62 can be improved.

[0062] [4] In a preferred embodiment, the work vehicle 1 according to the present embodiment further includes an inverter 63. The inverter 63 is mounted on the third bracket 90.

[0063] By placing the inverter 63 on the third bracket 90, the inverter 63 is accommodated in the same upper region 60a as the electric motor 62. This makes it possible to prevent oil adhering to the hydraulic pump 66 from adhering to the inverter 63. As a result, the reliability of the inverter 63 can be improved.

[0064] In addition, by placing the electric motor 62 and the inverter 63 on the third bracket 90 and assembling the hydraulic pump 66 below the third bracket 90, the electric motor 62, the inverter 63 and the hydraulic pump 66 can be assembled into an assembly.

[0065] The electrical wiring between the electric motor 62 and the inverter 63 is connected in advance. The assembly in this state is mounted on the work vehicle 1, and the hydraulic piping to the hydraulic pump 66 and the electrical wiring from the inverter 63 to the battery unit 70 are connected. This improves the ease of assembly to the work vehicle 1.

[0066] [5] In a preferred embodiment of the work vehicle 1 according to the present embodiment, the hydraulic pump 66 includes a plurality of hydraulic pumps 66a, 66b, 66c, which are connected in series. When the work vehicle 1 is equipped with a plurality of hydraulic pumps 66a, 66b, 66c, and the plurality of hydraulic pumps 66a, 66b, 66c are connected in series, the length of the electric motor-hydraulic pump connection unit in the direction of the rotation shaft 621 is longer than when there is only one hydraulic pump 66.

[0067] However, according to the work vehicle 1 according to this embodiment, the electric motor 62 and the hydraulic pump 66 are arranged in the equipment storage compartment 59 so that the output shaft of the electric motor 62 and the input shaft of the hydraulic pump 66 extend in the vertical direction relative to the work vehicle 1. Therefore, even if the number of hydraulic pumps 66 to be connected is increased, the electric motor-hydraulic pump connection unit can be arranged efficiently in the equipment storage compartment 59.

[0068] That is, according to the embodiment, it is possible to provide a work vehicle 1 that can effectively utilize the space in the equipment housing compartment 59 even when the number of connected hydraulic pumps 66 is increased.

[0069] 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. [Explanation of symbols]

[0070] 1...work vehicle, 59...equipment storage chamber, 62...electric motor, 621...rotating shaft, 63...inverter, 66, 66a, 66b, 66c...hydraulic pump, 90...third bracket (bracket)

Claims

1. A work vehicle comprising: a hydraulic pump; an electric motor that drives the hydraulic pump; and an equipment storage compartment that stores the hydraulic pump and the electric motor, an output shaft of the electric motor connected to an input shaft of the hydraulic pump; The work vehicle is characterized in that the electric motor is disposed either above or below the hydraulic pump.

2. The work vehicle according to claim 1, A work vehicle, wherein the electric motor is disposed above the hydraulic pump.

3. The work vehicle according to claim 2, The electric motor further includes a bracket on which the electric motor is mounted. The work vehicle is characterized in that the electric motor is mounted on the bracket.

4. The work vehicle according to claim 3, further comprising an inverter for controlling the electric motor; The work vehicle is characterized in that the inverter is mounted on the bracket.

5. A work vehicle according to any one of claims 1 to 4, the hydraulic pump includes a plurality of hydraulic pumps; A work vehicle characterized in that the plurality of hydraulic pumps are connected in series.

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