Electric work vehicle

Abstract

To provide an electric work vehicle that has excellent maintainability of harnesses and a motor and can prevent harnesses and a motor from being damaged by stones scattering from the ground.SOLUTION: An electric work vehicle includes: an inverter motor cover member 49 that is detachable and covers the part exposed downward from an inverter motor opening O2 of the inverter motor harness 25; and a motor cover member 50 that is detachable and covers the part exposed downward from a motor opening O3 of a motor M.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] A known example of a conventional electric work vehicle is the electric work vehicle described in Patent Document 1. The electric work vehicle described in Patent Document 1 is equipped with a battery (referred to in the document as a "driving battery [4]"), an inverter (referred to in the document as an "inverter

[14] ") that converts power from the battery from direct current to alternating current, a motor (referred to in the document as a "motor [M]") that is driven by power supplied from the inverter, a traveling device (referred to in the document as "front wheels

[10] , rear wheels

[11] ") that is driven by the motor, and a DC-DC converter (referred to in the document as a "voltage converter

[19] ") that steps down the power from the battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-953 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric work vehicle described above, the battery and the DC-DC converter are typically connected by a harness, and the inverter and the motor are also connected by a harness. In the electric work vehicle described above, it is desirable to easily perform maintenance on the harnesses and the motor and to prevent damage to the harnesses and the motor from flying stones from the ground.

[0005] In view of the above circumstances, there is a demand for an electric work vehicle that allows for easy maintenance of harnesses and motors and that can prevent damage to the harnesses and motors caused by flying stones from the ground. [Means for solving the problem]

[0006] The present invention is characterized by: A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; an inverter motor harness connecting the inverter and the motor; a vehicle frame that has an inverter motor opening that exposes the inverter motor harness downward and a motor opening that exposes the motor downward, and that supports the battery, the inverter, and the motor; a detachable inverter motor cover member for covering a portion of the inverter motor harness that is exposed downward from the inverter motor opening; a detachable motor cover member for covering a portion of the motor that is exposed downward through the motor opening; The key is to have the following features.

[0007] According to this characteristic configuration, stones flying from the ground Inverter motor harness And even if you try to hit the motor, Inverter motor cover member and motor cover member This will block the impact of flying stones from the ground. Inverter motor harness And damage to the motor can be prevented.

[0008] In addition, when performing maintenance, Inverter motor cover member and motor cover member By removing the Inverter motor harness The motor is exposed downwards. Inverter motor harness and motor from below, Inverter motor harness In addition, the motor can be easily maintained. The present invention is characterized by: A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; a DC-DC converter that steps down the power from the battery; a battery converter harness connecting the battery and the DC-DC converter; an inverter motor harness connecting the inverter and the motor; an aircraft frame that has a battery converter opening that exposes the battery converter harness downward and an inverter motor opening that exposes the inverter motor harness downward, and that supports the battery, the inverter, the motor, and the DC-DC converter; a detachable battery converter cover member for covering a portion of the battery converter harness that is exposed downward from the battery converter opening; a detachable inverter motor cover member for covering a portion of the inverter motor harness that is exposed downward from the inverter motor opening. According to this characteristic configuration, even if a stone flying from the ground strikes the battery converter harness and the inverter motor harness, the stone is blocked by the battery converter cover member and the inverter motor cover member, thereby preventing damage to the battery converter harness and the inverter motor harness caused by the stone flying from the ground. Furthermore, when performing maintenance, the battery converter harness and the inverter motor harness are exposed downward by removing the battery converter cover member and the inverter motor cover member, which allows access to the battery converter harness and the inverter motor harness from below, facilitating maintenance of the battery converter harness and the inverter motor harness. The present invention is characterized by: A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; a DC-DC converter that steps down the power from the battery; a battery converter harness connecting the battery and the DC-DC converter; an aircraft frame that has a battery converter opening that exposes the battery converter harness downward and a motor opening that exposes the motor downward, and that supports the battery, the inverter, the motor, and the DC-DC converter; a detachable battery converter cover member for covering a portion of the battery converter harness that is exposed downward from the battery converter opening; and a detachable motor cover member for covering a portion of the motor that is exposed downward from the motor opening. According to this characteristic configuration, even if a stone flying from the ground strikes the battery converter harness and the motor, the stone is blocked by the battery converter cover member and the motor cover member, thereby preventing damage to the battery converter harness and the motor from the stone flying from the ground. Furthermore, when performing maintenance, the battery converter cover member and the motor cover member can be removed to expose the battery converter harness and the motor below, allowing for easy access to the battery converter harness and the motor for maintenance.

[0009] Furthermore, in the present invention, The motor is configured as a water-cooled type, The aforementioned motor The cover member is preferably configured to cover the water-cooled portion of the motor.

[0010] According to this characteristic configuration, the water-cooled part of the motor motor It can be protected by a cover member.

[0011] Furthermore, in the present invention, The aforementioned Inverter motor cover member and said motor cover member It is preferable that a drain hole is formed in at least one of the above.

[0012] According to this characteristic configuration, Inverter motor cover member and motor cover member In at least one of the above, water accumulated inside can be discharged through the drain hole. Furthermore, in the present invention, It is preferable that at least one of the battery converter cover member and the inverter motor cover member has a drain hole formed therein. According to this characteristic configuration, water accumulated inside at least one of the battery converter cover member and the inverter motor cover member can be discharged through the drain hole. Furthermore, in the present invention, It is preferable that at least one of the battery converter cover member and the motor cover member has a drain hole formed therein. According to this characteristic configuration, water accumulated inside at least one of the battery converter cover member and the motor cover member can be discharged through the drain hole.

[0013] Furthermore, in the present invention, a transmission shaft that transmits power from the motor to the traveling device; The transmission shaft is the inverter motor cover member and the motor cover member It is preferable that the support member is supported by at least one of the above.

[0014] According to this characteristic configuration, the member for supporting the transmission shaft is: Inverter motor cover member and motor cover member At least one of these can be used. Furthermore, in the present invention, a transmission shaft that transmits power from the motor to the traveling device; It is preferable that the transmission shaft is supported by at least one of the battery converter cover member and the inverter motor cover member. According to this characteristic configuration, at least one of the battery converter cover member and the inverter motor cover member can be used as the member for supporting the transmission shaft. Furthermore, in the present invention, a transmission shaft that transmits power from the motor to the traveling device; It is preferable that the transmission shaft be supported by at least one of the battery converter cover member and the motor cover member. According to this characteristic configuration, at least one of the battery converter cover member and the motor cover member can be used as the member that supports the transmission shaft. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. 2 is a left side view showing the arrangement of an inverter and the like. [Figure 3] FIG. 2 is a diagram illustrating a flow of power transmission. [Figure 4] FIG. 2 is a left side cross-sectional view showing the configuration of the front part of the aircraft body. [Figure 5] FIG. 2 is a plan view showing the configuration of the front of the aircraft. [Figure 6] FIG. 2 is a bottom view showing the configuration of the front of the aircraft body. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of arrow F in the drawings will be referred to as "front," the direction of arrow B as "rear," the direction of arrow L as "left," and the direction of arrow R as "right." Furthermore, the direction of arrow U in the drawings will be referred to as "up," and the direction of arrow D as "down."

[0017] [Overall configuration of the tractor] The tractor of this embodiment will be described below. As shown in FIG. 1, the tractor has left and right front wheels 10 (equivalent to running gear) , left and right rear wheels 11 (equivalent to running gear) , and a cover member 12.

[0018] The tractor also includes a machine body frame 2 and a driving section 3. The machine body frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11.

[0019] The cover member 12 is disposed at the front of the vehicle body, and the driving section 3 is provided behind the cover member 12. In other words, the cover member 12 is disposed in front of the driving section 3.

[0020] The driver's section 3 has a protective frame 30, a driver's seat 31, and a steering wheel 32. An operator can sit in the driver's seat 31. This allows the operator to get into the driver's section 3. The left and right front wheels 10 are steered by operating the steering wheel 32. The operator can perform various driving operations in the driver's section 3.

[0021] The tractor has four running batteries. (equivalent to a battery) The cover member 12 is also configured to be swingable about an opening / closing axis Q that extends in the left-right direction of the vehicle body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in the closed state, the driving battery 4 is covered by the cover member 12.

[0022] As shown in Fig. 2, the tractor includes an inverter 14 and a motor M. The traction battery 4 supplies power to the inverter 14. The inverter 14 converts DC power from the traction battery 4 into AC power and supplies it to the motor M. The motor M is then driven by the AC power supplied from the inverter 14.

[0023] 2 and 3, the tractor is equipped with a hydrostatic continuously variable transmission 15 and a transmission 16. As shown in Fig. 3, the hydrostatic continuously variable transmission 15 has a hydraulic pump 15a and a hydraulic motor 15b.

[0024] The hydraulic pump 15a is driven by rotational power from the motor M. When the hydraulic pump 15a is driven, rotational power is output from the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is configured so that the speed of the rotational power is changed between the hydraulic pump 15a and the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is also configured so that the gear ratio can be changed continuously.

[0025] The rotational power output from the hydraulic motor 15 b is transmitted to the transmission 16 . The rotational power transmitted to the transmission 16 is changed in speed by a gear-type speed change mechanism of the transmission 16 and distributed to the left and right front wheels 10 and the left and right rear wheels 11. In this way, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0026] 2 and 3, the tractor is equipped with a mid PTO shaft 17 and a rear PTO shaft 18. The rotational power output from the motor M is distributed to the hydraulic pump 15a, the mid PTO shaft 17, and the rear PTO shaft 18. This causes the mid PTO shaft 17 and the rear PTO shaft 18 to rotate.

[0027] If a working device is connected to the mid PTO shaft 17 or the rear PTO shaft 18, the working device will be driven by the rotational power of the mid PTO shaft 17 or the rear PTO shaft 18. For example, as shown in FIG. 2, in this embodiment, a brush cutting device 19 is connected to the mid PTO shaft 17. The brush cutting device 19 is driven by the rotational power of the mid PTO shaft 17.

[0028] As shown in Figures 4 to 6, the motor M is disposed behind the inverter 14. The motor M and the inverter 14 are disposed below the driving battery 4. The motor M and the inverter 14 are disposed side by side in the fore-and-aft direction of the vehicle. Specifically, the motor M and the inverter 14 are disposed side by side in the fore-and-aft direction of the vehicle, with the inverter 14 located on the front side and the motor M located on the rear side.

[0029] The tractor includes a radiator 20, a DC (Direct Current) DC converter 21, and a battery 22. The radiator 20, the DC-DC converter 21, and the battery 22 are disposed in front of the traveling battery 4. The DC-DC converter 21 is disposed to the right of the radiator 20. The battery 22 is disposed to the right of the DC-DC converter 21.

[0030] Here, the inverter 14, the motor M, and the DCDC converter 21 are all water-cooled. The radiator 20 cools the coolant used to cool the inverter 14, the motor M, and the DCDC converter 21. A cooling hose 23 extending toward the inverter 14 is connected to the bottom of the radiator 20. The DCDC converter 21 steps down the power from the driving battery 4. The battery 22 supplies power to various electrical components. The power (high voltage) from the driving battery 4 is stepped down by the DCDC converter 21 and charged into the battery 22 as low-voltage power.

[0031] [Harnesses] As shown in FIGS. 4 to 6, a first harness 24 is provided between the driving battery 4 and the DC-DC converter 21. (equivalent to a battery converter harness)is provided. The first harness 24 is for supplying power from the driving battery 4 to the DCDC converter 21. An output part 4a to which the first harness 24 is connected is provided at the upper part of the front surface of the driving battery 4. An input part 21a to which the first harness 24 is connected is provided at the front part of the lower surface of the DCDC converter 21. The first harness 24 is arranged to extend downward from the output part 4a and then extend forward toward the input part 21a.

[0032] A second harness 25 that connects the inverter 14 and the motor M across the inverter 14 and the motor M (equivalent to inverter motor harness) is provided. The second harness 25 is for supplying power from the inverter 14 to the motor M. An output portion 14a to which the second harness 25 is connected is provided at the front part of the underside of the inverter 14. An input portion Ma to which the second harness 25 is connected is provided at the front end of the motor M. The second harness 25 is routed so as to extend rearward from the output portion 14a toward the input portion Ma.

[0033] [Aircraft frame] As shown in Figures 4 to 6, the vehicle frame 2 includes left and right side plates 40, left and right pedestals 41, a front plate 42, a rear plate 43, a bottom plate 44, and side plates 45. The left and right side plates 40 are spaced apart in the left-right direction of the vehicle. The space between the left side plate 40 and the right side plate 40 is used as a space for arranging the motor M. The radiator 20, the DC-DC converter 21, and the battery 22 are supported on a pedestal 46. The pedestal 46 is supported at the front of the left and right side plates 40.

[0034] The left pedestal 41 is provided so as to protrude to the left from the upper edge of the left side plate 40. The right pedestal 41 is provided so as to protrude to the right from the upper edge of the right side plate 40. The inverter 14 is supported by the left and right pedestals 41. The driving battery 4 is supported by a support base 47. The support base 47 is supported by the left and right pedestals 41 and also by the rear plate 43.

[0035] The front plate 42 is provided across the front end of the left side plate 40 and the front end of the right side plate 40. The rear plate 43 is provided across the rear end of the left side plate 40 and the rear end of the right side plate 40. A motor M is supported on the rear plate 43. The bottom plate 44 is provided across the lower edge of the left side plate 40 and the lower edge of the right side plate 40. The cross plate 45 is provided behind the bottom plate 44 and across the left side plate 40 and the right side plate 40.

[0036] The body frame 2 has a first opening O1 between the front edge of the front plate 42 and the bottom plate 44 and the left and right side plates 40. (equivalent to the battery converter opening) A second opening O2 is formed in a portion of the bottom plate 44 that is located below the rear portion of the second harness 25. (equivalent to inverter motor opening) A third opening O3 is formed in the airframe frame 2 between the rear edge of the rear plate 43 and the bottom plate 44 and the left and right side plates 40. (equivalent to motor opening) That is, the body frame 2 is provided with a first opening O1, a second opening O2, and a third opening O3.

[0037] The first opening O1 is configured to expose the first harness 24 and the cooling hose 23 downward. The second opening O2 is configured to expose the second harness 25 downward. The third opening O3 is configured to expose the motor M (specifically, the portion (water-cooled portion) Mb of the motor M through which the cooling water flows) downward.

[0038] [Cover member] As shown in FIGS. 4 to 6, the machine body frame 2 includes a first cover member 48 (Equivalent to the battery converter cover material) , second cover member 49 (Equivalent to inverter motor cover material) and the third cover member 50 (Equivalent to the motor cover material)is attached. The first cover member 48 is configured to cover the first opening O1. That is, the first cover member 48 is configured to cover the portion of the first harness 24 that is exposed downward from the first opening O1 and the portion of the cooling hose 23 that is exposed downward from the first opening O1. The portion of the first harness 24 that is exposed downward from the first opening O1 and the portion of the cooling hose 23 that is exposed downward from the first opening O1 are covered from below by the first cover member 48.

[0039] The first cover member 48 has a horizontal surface portion 48a, left and right bent portions 48b, and a notch portion 48c. The bent portions 48b are formed in a shape that bends upward relative to the horizontal surface portion 48a so as to fit along the side plate 40. Components surrounding the first cover member 48 (for example, components supporting the front portion of the brush cutting device 19) fit into the notch portion 48c, so that the first cover member 48 does not interfere with the components surrounding the first cover member 48. The first cover member 48 is fixed to the left and right side plates 40 with a plurality of bolts 51. Specifically, the bent portions 48b are fixed to the side plate 40 with a plurality of bolts 51 (two in this embodiment) in a state where they are abutted against the side plate 40 from the outer lateral side.

[0040] The second cover member 49 is configured to cover the second opening O2. That is, the second cover member 49 is configured to cover a portion of the second harness 25 that is exposed downward from the second opening O2. The portion of the second harness 25 that is exposed downward from the second opening O2 is covered from below by the second cover member 49.

[0041] A plurality of (four in this embodiment) drain holes 49a are formed in the second cover member 49. The drain holes 49a are formed in a portion of the second cover member 49 that faces the second opening O2. The second cover member 49 is fixed to the bottom plate 44 with a plurality of (four in this embodiment) bolts 52 in a state where it is abutted against the bottom plate 44 from below.

[0042] The third cover member 50 is configured to cover the third opening O3. That is, the third cover member 50 is configured to cover the portion of the motor M that is exposed downward from the third opening O3. In this embodiment, the third cover member 50 is configured to cover the water-cooled unit Mb of the motor M. The portion of the motor M that is exposed downward from the third opening O3 (water-cooled unit Mb) is covered from below by the third cover member 50.

[0043] In the present embodiment, the third cover member 50 is configured to partially cover the third opening O3. A portion of the third opening O3 between the front edge of the third cover member 50 and the rear edge of the bottom plate 44, and a portion between the rear edge of the third cover member 50 and the rear plate 43 are not covered by the third cover member 50. The third cover member 50 is fixed to the side plate 45 with a plurality of bolts 53 (two in the present embodiment) while being abutted against the side plate 45 from below.

[0044] Here, a transmission shaft 54 that transmits power from the motor M (power from the transmission 16) to the left and right front wheels 10 is provided below the bottom plate 44. The transmission shaft 54 is supported by the third cover member 50 via a stay 55.

[0045] [Another embodiment] (1) In the above embodiment, the first cover member 48 is configured to partially cover the first opening O1. However, the first cover member 48 may be configured to entirely cover the first opening O1.

[0046] (2) In the above embodiment, the second cover member 49 is configured to cover the entire second opening O2. However, the second cover member 49 may be configured to cover only part of the second opening O2.

[0047] (3) In the above embodiment, the third cover member 50 is configured to partially cover the third opening O3. However, the third cover member 50 may be configured to entirely cover the third opening O3.

[0048] (4) In the above embodiment, the third cover member 50 is configured to cover the water-cooled portion Mb of the motor M. However, the third cover member 50 may be configured to cover not only the water-cooled portion Mb of the motor M but also portions of the motor M other than the water-cooled portion Mb.

[0049] (5) In the above embodiment, four drain holes 49a are formed in the second cover member 49. However, one to three or five or more drain holes 49a may be formed in the first cover member 48.

[0050] (6) In the above embodiment, the transmission shaft 54 is supported by the third cover member 50. However, the transmission shaft 54 may be supported by the second cover member 49 instead of or together with the third cover member 50. [Industrial Applicability]

[0051] The present invention can be used not only in tractors but also in combine harvesters, rice transplanters, and utility vehicles (multi-purpose vehicles). [Explanation of symbols]

[0052] 2. Aircraft frame 4. Driving battery (battery) 10 days ago car Wheels (running gear) after 11 car Wheels (running gear) 14 Inverter 21 DC-DC converter 24 First Harness (Battery converter harness) 25 Second Harness (Inverter motor harness) 48 First cover member (Battery converter cover material) 49 Second cover member (Inverter motor cover) 49a Drain hole 50 Third cover member (Motor cover member) 54 Transmission shaft Medium motor Mb water cooling section O1 First opening (Battery converter opening) O2 Second opening (Inverter motor opening) O3 third opening (Motor opening)

Claims

1. A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; an inverter motor harness connecting the inverter and the motor; a vehicle frame that has an inverter motor opening that exposes the inverter motor harness downward and a motor opening that exposes the motor downward, and that supports the battery, the inverter, and the motor; a detachable inverter motor cover member for covering a portion of the inverter motor harness that is exposed downward from the inverter motor opening; and a detachable motor cover member that covers the portion of the motor that is exposed downward from the motor opening.

2. A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; a DC-DC converter that steps down the power from the battery; a battery converter harness connecting the battery and the DC-DC converter; an inverter motor harness connecting the inverter and the motor; an aircraft frame that has a battery converter opening that exposes the battery converter harness downward and an inverter motor opening that exposes the inverter motor harness downward, and that supports the battery, the inverter, the motor, and the DCDC converter; a detachable battery converter cover member for covering a portion of the battery converter harness that is exposed downward from the battery converter opening; and a detachable inverter motor cover member that covers a portion of the inverter motor harness that is exposed downward from the inverter motor opening.

3. A battery, an inverter that converts the power from the battery from DC to AC; a motor driven by power supplied from the inverter; a traveling device driven by the motor; a DC-DC converter that steps down the power from the battery; a battery converter harness connecting the battery and the DC-DC converter; an aircraft frame that has a battery converter opening that exposes the battery converter harness downward and a motor opening that exposes the motor downward, and that supports the battery, the inverter, the motor, and the DCDC converter; a detachable battery converter cover member for covering a portion of the battery converter harness that is exposed downward from the battery converter opening; and a detachable motor cover member that covers the portion of the motor that is exposed downward from the motor opening.

4. The motor is configured as a water-cooled type, 4. The electric work vehicle according to claim 1, wherein the motor cover member is configured to cover a water-cooled portion of the motor.

5. 2. The electric work vehicle according to claim 1, wherein at least one of the inverter motor cover member and the motor cover member has a drain hole formed therein.

6. 3. The electric work vehicle according to claim 2, wherein at least one of the battery converter cover member and the inverter motor cover member has a drain hole formed therein.

7. 4. The electric work vehicle according to claim 3, wherein at least one of the battery converter cover member and the motor cover member has a drain hole formed therein.

8. a transmission shaft that transmits power from the motor to the traveling device; 6. The electric work vehicle according to claim 1, wherein the transmission shaft is supported by at least one of the inverter motor cover member and the motor cover member.

9. a transmission shaft that transmits power from the motor to the traveling device; 7. The electric work vehicle according to claim 2 or 6, wherein the transmission shaft is supported by at least one of the battery converter cover member and the inverter motor cover member.

10. a transmission shaft that transmits power from the motor to the traveling device; 8. The electric work vehicle according to claim 3 or 7, wherein the transmission shaft is supported by at least one of the battery converter cover member and the motor cover member.

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