Electric work vehicle

Abstract

The electric work vehicle is provided with a wire harness that connects the front part of the motor (40) and the inverter, and is provided with a positioning mechanism (7) that has: a first guide part (71) that is provided to one of the motor (40) and the support member (50), and a second guide part (71) that is provided to the other of the motor (40) and the support member (50); and a second guide part (72) which is provided on the other of the motor (40) and the support member (50), and which positions the motor (40) relative to the support member (50) when viewed in the front-rear direction by the mutual contact between the first guide part (71) and the second guide part (72), the positioning mechanism (7) being configured so as to position the motor (40) relative to the support member (50) when the motor (40) is attached to the support member (50). The first guide part (71) and the second guide part (72) can abut against each other in a state that the protruding part (45) is located at a position closer to the front side than the supporting front surface (51).

Description

Technical Field

[0001] The present invention relates to an electric work vehicle equipped with a battery and a motor. Background Art

[0002] As such an electric work vehicle, for example, an electric work vehicle described in Patent Document 1 is known. In this electric work vehicle (a "tractor" in Patent Document 1), the motor is driven by electric power supplied from a battery (a "travel battery" in Patent Document 1).

[0003] This electric work vehicle is equipped with an inverter that converts DC power from the battery into AC power and supplies it to the motor.

[0004] This motor is supported by a front support frame and a support member (a "rear support frame" in Patent Document 1). More specifically, the front support frame supports the front portion of the motor from below. In addition, the support member is in contact with the rear end portion of the motor and supports the rear portion of the motor.

[0005] In addition, the output shaft of this motor passes through the support member and extends rearward.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-953 Summary of the Invention

[0009] Technical Problem to be Solved by the Invention

[0010] In the electric work vehicle described in Patent Document 1, a configuration without a front support frame is considered. In this case, the motor is supported by the support member in a cantilever shape. In such a configuration, if a recess that recesses rearward is formed on the front surface of the support member and a protrusion that fits into the recess is formed at the rear end portion of the motor, when the motor is mounted on the support member, the motor can be positioned relative to the support member in the front-rear direction by the fitting of the recess and the protrusion.

[0011] However, in a configuration having such a recess and a protrusion, when the support member is made of a material having a relatively high hardness (e.g., iron), it is conceivable that damage may occur on the surface of the protrusion due to the contact of the protrusion with the recess and its periphery when the recess and the protrusion are fitted.

[0012] In addition, in the electric work vehicle described in Patent Document 1, when a wiring harness that connects the motor and the inverter is provided, it is conceivable that the connection portion of the wiring harness in the motor and the wiring harness itself may interfere with the installation operation of the motor on the support member. As a result, it is conceivable that the installation operation of the motor on the support member cannot be carried out smoothly.

[0013] An object of the present invention is to provide an electric work vehicle that can smoothly perform an installation operation when a motor is mounted on a support member, can position the motor, and can easily avoid damage to the surface of the motor.

[0014] Technical solution for solving technical problems

[0015] The present invention is characterized in that an electric work vehicle includes: a battery; a motor supported by a support member and driven by electric power supplied from the battery; an inverter that converts DC power from the battery into AC power and supplies it to the motor; and a wire harness that connects the front part of the motor to the inverter, and supplies electric power from the inverter to the motor via the wire harness. The motor is supported by the support member in a state where an output shaft of the motor penetrates the support member and extends rearward. A recess recessed rearward is formed in a support front surface that is a front surface of the support member. The motor has a contact surface that contacts the support front surface and a protruding portion that protrudes rearward from the contact surface and fits into the recess. The protruding portion is made of a first material, and the support member is made of a second material having a higher hardness than the first material. A positioning mechanism is provided, which has a first guide portion provided on one of the motor and the support member and a second guide portion provided on the other of the motor and the support member, and positions the motor relative to the support member when viewed in the front-rear direction by mutual contact of the first guide portion and the second guide portion. The positioning mechanism is configured such that when the motor is mounted on the support member, the first guide portion and the second guide portion can be in mutual contact in a state where the protruding portion is located at a position closer to the front side than the support front surface.

[0016] According to this configuration, when the motor is mounted on the support member, the first guide portion and the second guide portion are in mutual contact before the protruding portion fits into the recess. Thereby, the motor can be positioned. Further, by moving the motor rearward in a state where the first guide portion and the second guide portion are in contact with each other, the protruding portion can be fitted into the recess in a state where the motor is positioned relative to the support member when viewed in the front-rear direction. Therefore, compared with the case where the protruding portion is fitted into the recess in a state where the motor is not positioned relative to the support member (a state where the motor is freely moved relative to the support member when viewed in the front-rear direction), it is difficult to cause damage to the surface of the protruding portion.

[0017] Moreover, according to this configuration, the motor is mounted on the support member from the front, and the wiring harness connecting the motor and the inverter is connected to the front portion of the motor. Therefore, compared with the case where the wiring harness is connected to the rear portion of the motor, the connection portion of the wiring harness in the motor and the wiring harness itself are less likely to interfere with the installation operation of the motor on the support member.

[0018] That is, according to this configuration, it is possible to realize an electric work vehicle in which when the motor is mounted on the support member, the installation operation can be smoothly performed, the positioning of the motor can be carried out, and it is easy to avoid damage to the surface of the motor.

[0019] Moreover, in the present invention, it is preferable that the first guiding portion is a pin extending in the front-rear direction, the second guiding portion is a hole portion that fits with the pin, and the positioning mechanism has a plurality of positioning portions, and each of the positioning portions includes one corresponding first guiding portion and one second guiding portion.

[0020] According to this configuration, a positioning mechanism for positioning the motor relative to the support member when viewed in the front-rear direction can be realized with a relatively simple configuration. Moreover, by fitting a plurality of sets of pins and hole portions with each other, during the installation operation of the motor, it is possible to prevent the motor from rotating relative to the support member when viewed in the front-rear direction. Therefore, compared with the case where there is only one set of pins and hole portions in the positioning mechanism, the operation of mounting the motor on the support member becomes easier.

[0021] Moreover, in the present invention, it is preferable that the positioning mechanism has three or more of the positioning portions.

[0022] In the case where there are only two positioning portions in the positioning mechanism, for example, consider arranging one positioning portion on each of the left and right sides of the axis of the output shaft of the motor. In this case, when viewed in the front-rear direction, when the axis of the output shaft is located on the straight line connecting the two positioning portions and the distances from the axis of the output shaft to each positioning portion are equal, consider the case where the operator mounting the motor on the support member erroneously mounts it in a posture where the motor is reversed up and down.

[0023] Here, according to this configuration, compared with the case where there are only two positioning portions in the positioning mechanism, when the operator mounting the motor on the support member observes the arrangement of the pins and hole portions, it is easier to accurately grasp the correspondence between the pins and hole portions. Therefore, it is less likely to occur that the operator mounting the motor on the support member erroneously attempts to mount it in a posture where the motor is reversed up and down.

[0024] Moreover, in the present invention, it is preferable that the positioning mechanism has three of the positioning portions, and the three positioning portions are arranged such that the triangle formed by the positions of the three positioning portions is not an equilateral triangle when viewed in the front-rear direction.

[0025] When there are only three positioning portions in the positioning mechanism, for example, consider arranging the respective positions of the three positioning portions such that a triangle with the respective positions of the three positioning portions as vertices is an equilateral triangle. In this configuration, when observing in the front-rear direction, if the distances from the axis of the output shaft to the respective positioning portions are equal, it is conceivable that an operator mounting the motor on the support member mounts the motor in a posture rotated 120 degrees to the left or right from the correct posture.

[0026] Here, according to this configuration, the three positioning portions are arranged such that a triangle with the respective positions of the three positioning portions as vertices is not an equilateral triangle. Thereby, only when the motor is in the correct posture when observing in the front-rear direction, all the pins can be engaged with the hole portions. Therefore, it is possible to prevent an operator mounting the motor on the support member from mounting the motor in a posture rotated 120 degrees to the left or right from the correct posture as described above.

[0027] Moreover, in the present invention, preferably, the plurality of positioning portions are arranged separately above and below the axis of the output shaft.

[0028] When the plurality of positioning portions are concentratedly arranged above or below the axis of the output shaft, in a state where each pin is engaged with the corresponding hole portion, due to the weight of the motor or the like, it is easy to apply a relatively large stress to the pin from the motor. Therefore, in order to prevent the pin from being damaged due to this stress, it is necessary to form the pin from a material with relatively high strength or the like. As a result, the manufacturing cost tends to increase.

[0029] Here, according to this configuration, compared with the case where the plurality of positioning portions are concentratedly arranged above or below the axis of the output shaft, it is difficult to apply a relatively large stress to the pin from the motor. Therefore, it is possible to avoid an increase in the manufacturing cost in order to prevent the pin from being damaged.

[0030] Moreover, in the present invention, preferably, the number of the positioning portions arranged at a position above the axis is larger than the number of the positioning portions arranged at a position below the axis among the plurality of positioning portions.

[0031] In a state where each pin is engaged with the corresponding hole portion, due to the weight of the motor or the like, stress is applied to each pin from the motor. Here, the total stress applied from the motor to each pin arranged above the axis among the plurality of pins included in the positioning mechanism is likely to be greater than the total stress applied from the motor to each pin arranged below the axis. Therefore, when the number of pins arranged above the axis is relatively small, it is easy to apply a relatively large stress to each pin arranged above the axis. Therefore, in order to prevent the pin from being damaged due to this stress, it is necessary to form the pin from a material with relatively high strength or the like. As a result, the manufacturing cost tends to increase.

[0032] Here, according to this configuration, the number of pins arranged at a position above the axis is relatively large. Therefore, it is not easy to apply a relatively large stress to each pin arranged above the axis. Thus, it is possible to avoid an increase in manufacturing cost to prevent pin breakage.

[0033] Moreover, in the present invention, preferably, the pin is mounted on a pin mounting surface which is one of the support front surface and the abutment surface, and protrudes forward or backward from the pin mounting surface, and the length from the pin mounting surface to the protruding end of the pin is longer than the protruding length of the protruding portion.

[0034] According to this configuration, it is easy to reliably achieve a configuration in which the pin and the hole portion can be brought into contact with each other in a state where the protruding portion is located on the front side of the support front surface when the motor is mounted on the support member. That is, according to this configuration, it is easy to reliably achieve an electric work vehicle that can position the motor when the motor is mounted on the support member and is easy to avoid damage to the surface of the motor.

[0035] Moreover, in the present invention, preferably, a pointed portion is formed at the protruding end portion of the pin, and the length from the pin mounting surface to the base end of the pointed portion is longer than the protruding length of the protruding portion.

[0036] According to this configuration, a pointed portion is formed at the protruding end portion of the pin. Therefore, when the motor is mounted on the support member, it is easy for an operator to insert the pin into the hole portion.

[0037] In addition, during the period from when the front end of the pointed portion starts to enter the hole portion until the base end of the pointed portion enters the hole portion, the deeper the pointed portion enters the hole portion, the higher the positioning accuracy of the motor when observed in the front-rear direction. Moreover, according to this configuration, in a state where the protruding portion is located on the front side of the support front surface, it is possible to cause the entire front end to the base end of the pointed portion to enter the hole portion. Thus, when the motor is mounted on the support member, high-precision positioning can be achieved before the protruding portion is engaged with the concave portion.

[0038] Moreover, in the present invention, preferably, the pin is mounted on the motor, and the hole portion is provided in the support member.

[0039] When the pin is mounted on the support member and the hole portion is provided in the motor, when the pin and the hole portion are engaged, it is assumed that damage may occur around the hole portion of the motor due to the contact between the pin and the hole portion and its periphery.

[0040] Here, according to this configuration, the pin is mounted on the motor and the hole portion is provided in the support member. Therefore, it is possible to avoid the situation of damage to the motor as described above.

[0041] Moreover, in the present invention, preferably, the motor is fastened to the support member by a fastening device, and in the radial direction of the output shaft, the positioning portion is located on the inner peripheral side of the fastening device.

[0042] When the positioning portion is located on the outer peripheral side of the fastening device, it is easy to form a hole portion at a position close to the outer periphery when viewed in the front-rear direction on one side of the motor and the support member where the hole portion is provided. As a result, it is conceivable that the strength around the hole portion becomes low. Therefore, it is often necessary to take measures to strengthen the periphery of the hole portion and the like. Thus, the manufacturing cost is likely to increase.

[0043] Here, according to this configuration, the hole portion is formed at a position on the inner peripheral side of the fastening device. Therefore, it is easy to avoid the situation where the strength around the hole portion becomes low as described above. Therefore, it is not necessary to take measures such as strengthening the periphery of the hole portion. Thus, it is easy to avoid an increase in the manufacturing cost.

[0044] Moreover, in the present invention, preferably, the motor is supported by the support member in a cantilever shape.

[0045] According to this configuration, compared with the case where the support structure of the motor is not in a cantilever shape (for example, a double-supported shape), the support structure of the motor is likely to be simple. Thus, it is easy to suppress an increase in the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a left side view of a tractor.

[0047] Figure 2 It is a partially cutaway top view showing the configuration of the motor and the like.

[0048] Figure 3 It is a front view showing the configuration of the support member and the like.

[0049] Figure 4 It is a cross-sectional view showing the configuration of the positioning portion and the like.

[0050] Figure 5 It is a partially cutaway left side view showing the configuration of the motor and the like.

[0051] Figure 6 It is a partially cutaway left side view showing the configuration of the motor and the like in another embodiment (10). DETAILED DESCRIPTION OF THE INVENTION

[0052] A description will be given of the manner for implementing the present invention with reference to the accompanying drawings. In addition, in the following description, unless otherwise specified, the direction of arrow F in the drawings is defined as "front", the direction of arrow B as "rear", the direction of arrow L as "left", and the direction of arrow R as "right". Further, the direction of arrow U in the drawings is defined as "up", and the direction of arrow D as "down".

[0053] 〔Overall Structure of Tractor〕

[0054] Hereinafter, a description will be given of a tractor 1 (corresponding to the "electric work vehicle" of the present invention) according to the present embodiment. As Figure 1 shown, the tractor 1 includes left and right front wheels 10, left and right rear wheels 11, and a hood member 12.

[0055] In addition, the tractor 1 includes a body frame 2 and a driver's cab 3. The body frame 2 is supported by the left and right front wheels 10 and the left and right rear wheels 11.

[0056] The hood member 12 is disposed at the front of the body. Moreover, the driver's cab 3 is provided behind the hood member 12. In other words, the hood member 12 is disposed in front of the driver's cab 3.

[0057] The driver's cab 3 has a protective frame 30, a driver's seat 31, and a steering wheel 32. An operator can sit on the driver's seat 31. Thus, the operator can board the driver's cab 3. By operating the steering wheel 32, the left and right front wheels 10 are steered. The operator can perform various driving operations in the driver's cab 3.

[0058] The tractor 1 includes a battery 4. In addition, the hood member 12 is configured to be swingable about an opening / closing axis Q along the left - right direction of the body. Thus, the hood member 12 is configured to be openable and closable. When the hood member 12 is in the closed state, the battery 4 is covered by the hood member 12.

[0059] The tractor 1 includes an inverter 14 and a motor 40. The motor 40 is located below the battery 4. In addition, the motor 40 is located behind the inverter 14.

[0060] The battery 4 supplies power to the inverter 14. The inverter 14 converts the DC power from the battery 4 into AC power and supplies it to the motor 40. Moreover, the motor 40 is driven by the AC power supplied from the inverter 14.

[0061] That is, the tractor 1 includes an inverter 14 that converts the DC power from the battery 4 into AC power and supplies it to the motor 40.

[0062] As Figure 1As shown, the tractor 1 is equipped with a wiring harness 13. In addition, the motor 40 has a connection part 41. The connection part 41 is located at the front part of the motor 40. The wiring harness 13 connects the connection part 41 to the lower end part at the front of the inverter 14. That is, the tractor 1 is equipped with the wiring harness 13 that connects the front part of the motor 40 to the inverter 14. Electric power is supplied from the inverter 14 to the motor 40 via the wiring harness 13.

[0063] The tractor 1 is equipped with a hydrostatic continuously variable transmission 15 and a transmission 16. The driving force output from the motor 40 is distributed to the hydrostatic continuously variable transmission 15 and the working device 19. The hydrostatic continuously variable transmission 15 varies the speed of the driving force received from the motor 40 and transmits it to the transmission 16.

[0064] The hydrostatic continuously variable transmission 15 includes a hydraulic pump and a hydraulic motor, and is configured to be able to continuously change the speed ratio without steps. The configuration of such a hydrostatic continuously variable transmission 15 is well-known, so the detailed description of the hydrostatic continuously variable transmission 15 is omitted.

[0065] The driving force transmitted to the transmission 16 is varied by the gear-type speed-changing mechanism of the transmission 16 and distributed to the left and right front wheels 10 and the left and right rear wheels 11. Thereby, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0066] The working device 19 is driven by the driving force from the motor 40. In the present embodiment, the working device 19 is specifically a mowing device. However, the present invention is not limited thereto, and the working device 19 may be, for example, a tilling device, a fertilizing device, etc.

[0067] As Figure 1 shown, the body frame 2 includes left and right main frames 20 and a support member 50. The left and right main frames 20 extend in the front-rear direction. The support member 50 is a plate-shaped member. The support member 50 is arranged in an attitude perpendicular to the front-rear direction. The front surface of the support member 50 abuts against the rear ends of the left and right main frames 20. The support member 50 is connected to the rear ends of the left and right main frames 20. Although not particularly limited, the support member 50 may be connected to the rear ends of the left and right main frames 20 by welding, for example.

[0068] The motor 40 is supported by the support member 50. That is, the tractor 1 is equipped with the motor 40 that is supported by the support member 50 and is driven by the electric power supplied from the battery 4. In addition, as Figure 5 shown, the battery 4 is supported by the support frame 35. The support frame 35 is supported by the body frame 2.

[0069] 〔Oil pump〕

[0070] As Figure 2As shown, the tractor 1 is equipped with an oil pump 60. The oil pump 60 is provided on the right side of the machine body. The oil pump 60 is driven by the driving force from the motor 40. Moreover, the oil pump 60 supplies working oil to each part of the machine body.

[0071] The transmission structure of the driving force to the oil pump 60 will be described in detail. As Figure 2 and Figure 5 shown, the motor 40 is supported by the support member 50 in a cantilevered state with the rear end portion of the motor 40 supported by the support member 50. The output shaft 42 of the motor 40 penetrates the support member 50 and extends rearward. That is, the motor 40 is supported by the support member 50 in a state where the output shaft 42 of the motor 40 penetrates the support member 50 and extends rearward.

[0072] As Figure 2 shown, a gearbox 61 is provided behind the support member 50. In addition, a flange portion 43 extending radially outward of the output shaft 42 is formed at the rear end portion of the motor 40. And the flange portion 43, the support member 50, and the gearbox 61 are fastened together by a plurality of fastening devices 62. That is, the motor 40 is fastened to the support member 50 by the fastening devices 62.

[0073] In the present embodiment, as Figure 3 shown, the number of the fastening devices 62 is six. However, the present invention is not limited thereto, and the number of the fastening devices 62 may be five or less, or may be seven or more.

[0074] In addition, the fastening device 62 in the present embodiment is specifically a bolt. However, the present invention is not limited thereto. The fastening device 62 may be composed of a bolt and a nut, for example, or may be a rivet or the like.

[0075] As Figure 2 shown, a cylindrical member 63 extending in the front-rear direction is mounted on the output shaft 42. The output shaft 42 is inserted into the cylindrical member 63. The cylindrical member 63 is arranged in a state of penetrating the support member 50 and the gearbox 61.

[0076] An input gear 64 is fixed to the cylindrical member 63. In addition, the input gear 64 may be integrally formed with the cylindrical member 63, or may be separate from the cylindrical member 63.

[0077] The cylindrical member 63 is configured to rotate integrally with the output shaft 42. Thus, the driving force from the output shaft 42 is transmitted to the input gear 64 via the cylindrical member 63.

[0078] As Figure 3As shown, the tractor 1 is equipped with four transmission gears 65. The driving force transmitted from the output shaft 42 to the input gear 64 is transmitted to the input shaft 66 of the oil pump 60 via the four transmission gears 65. According to this configuration, the oil pump 60 is driven by the driving force from the output shaft 42.

[0079] In addition, the input gear 64 and each transmission gear 65 are housed in a space surrounded by the support member 50 and the gearbox 61.

[0080] In addition, as Figure 2 shown, a transmission shaft 67 is connected to the rear end portion of the cylindrical member 63. The driving force transmitted from the cylindrical member 63 to the transmission shaft 67 is distributed to the hydrostatic continuously variable transmission 15 (refer to Figure 1 ) and the working device 19 (refer to Figure 1 ).

[0081] 〔Recesses and protrusions〕

[0082] As Figures 2 to 4 shown, a recess 52 is formed on the front support surface 51. The front support surface 51 is the front surface of the support member 50. The recess 52 is recessed rearward. That is, a recess 52 that is recessed rearward is formed on the front surface of the support member 50, which is the front support surface 51.

[0083] As Figure 3 shown, the recess 52 is formed in a ring shape so as to surround the hole (opening) in the support member 50. The output shaft 42 passes through this hole.

[0084] As Figure 2 and Figure 4 shown, the motor 40 has a contact surface 44 and a protrusion 45. The contact surface 44 is the vertical surface at the rear end portion of the motor 40. The contact surface 44 is the rear surface of the motor 40. In the state where the motor 40 is mounted on the support member 50, the contact surface 44 abuts against the front support surface 51.

[0085] The protrusion 45 protrudes rearward more than the contact surface 44. In addition, the protrusion 45 is in the shape of a cylinder (ring) extending in the front-rear direction. The output shaft 42 passes through the inside of the protrusion 45. And the protrusion 45 has a shape that fits with the recess 52. That is, the motor 40 has a contact surface 44 that abuts against the front support surface 51 and a protrusion 45 that protrudes rearward more than the contact surface 44 and fits with the recess 52.

[0086] In addition, as Figure 2 and Figure 4 shown, a ring-shaped collar 68 can also be installed in the recess 52. It can also be that, in the state where the motor 40 is mounted on the support member 50, the rear end of the protrusion 45 abuts against the collar 68.

[0087] As Figure 2 andFigure 4 As shown, the motor 40 has a housing 46. The housing 46 is formed in a cylindrical shape (substantially cylindrical). The flange portion 43, the abutting surface 44, and the protruding portion 45 are included in the housing 46.

[0088] The housing 46 is made of a prescribed first material. That is, the protruding portion 45 is made of the first material. Although not particularly limited, the first material can be, for example, aluminum alloy or other metal.

[0089] The support member 50 is made of a prescribed second material. The second material is a material having a higher hardness than the first material. That is, the support member 50 is made of the second material having a higher hardness than the first material. Although not particularly limited, the second material can be, for example, iron or other metal.

[0090] 〔Positioning mechanism〕

[0091] As Figure 2 shown, the tractor 1 is provided with a positioning mechanism 7. The positioning mechanism 7 is a mechanism for positioning the motor 40 relative to the support member 50 when viewed in the front-rear direction. Hereinafter, the positioning mechanism 7 will be described in detail.

[0092] As Figure 2 shown, the positioning mechanism 7 has a plurality of positioning portions 70. Although not particularly limited, it is preferable that the positioning mechanism 7 has three or more positioning portions 70. In the present embodiment, the positioning mechanism 7 has three positioning portions 70.

[0093] As Figure 3 and Figure 4 shown, each positioning portion 70 includes a corresponding first guiding portion 71 and a second guiding portion 72. In the present embodiment, the first guiding portion 71 is a pin 8 extending in the front-rear direction. In addition, the second guiding portion 72 is a hole portion 9 that fits with the pin 8. In addition, each positioning portion 70 has the same structure as each other. Figure 4 The positioning portion 70 shown is Figure 2 and Figure 3 the leftmost positioning portion 70 among the three positioning portions 70 shown.

[0094] As Figure 4 shown, the pin 8 is installed on the motor 40. In addition, the hole portion 9 is provided in the support member 50. That is, in the present embodiment, the first guiding portion 71 is provided on the motor 40, and the second guiding portion 72 is provided in the support member 50. However, the present invention is not limited thereto, and it may be that the first guiding portion 71 (pin 8) is provided in the support member 50 and the second guiding portion 72 (hole portion 9) is provided on the motor 40.

[0095] The positioning mechanism 7 is configured to position the motor 40 relative to the support member 50 when viewed in the front-rear direction by the mutual contact of the first guide portion 71 and the second guide portion 72. More specifically, the positioning mechanism 7 is configured to position the motor 40 relative to the support member 50 when viewed in the front-rear direction by the mutual fitting of the respective pins 8 and the respective hole portions 9. In addition, in this specification, "fitting" is a specific example of "contact".

[0096] That is, the tractor 1 has a positioning mechanism 7, and the positioning mechanism 7 has: a first guide portion 71 provided on one of the motor 40 and the support member 50; and a second guide portion 72 provided on the other of the motor 40 and the support member 50, and the positioning mechanism 7 positions the motor 40 relative to the support member 50 when viewed in the front-rear direction by the mutual contact of the first guide portion 71 and the second guide portion 72.

[0097] By the positioning of the positioning mechanism 7, as Figure 3 shown, when viewed in the front-rear direction, the axis 42a of the output shaft 42 is positioned at the center of the hole (opening) surrounded by the concave portion 52.

[0098] In addition, in Figure 3 a triangle T is shown. The three vertices of the triangle T are the respective positions of the three positioning portions 70 when viewed in the front-rear direction. In the present embodiment, as Figure 3 shown, the triangle T is not an equilateral triangle. That is, when viewed in the front-rear direction, the three positioning portions 70 are arranged such that the triangle T with the respective positions of the three positioning portions 70 as vertices is not an equilateral triangle.

[0099] As Figure 3 shown, two of the three positioning portions 70 are arranged at positions above the axis 42a. The remaining one of the three positioning portions 70 is arranged at a position below the axis 42a. That is, the plurality of positioning portions 70 are arranged separately above and below the axis 42a of the output shaft 42. In addition, the number of the positioning portions 70 arranged at positions above the axis 42a among the plurality of positioning portions 70 is larger than the number of the positioning portions 70 arranged at positions below the axis 42a.

[0100] In addition, in Figure 3 a configuration circle E is shown. The configuration circle E is a circle centered on the axis 42a when viewed in the front-rear direction. Each fastening device 62 is arranged on the configuration circle E. Moreover, each positioning portion 70 is located inside the configuration circle E. That is, in the radial direction of the output shaft 42, the positioning portion 70 is located on the inner peripheral side of the fastening device 62.

[0101] As Figure 4As shown, the pin 8 is installed on the pin mounting surface P which is one of the support front surface 51 and the abutment surface 44. In the present embodiment, the pin mounting surface P is the abutment surface 44. That is, the pin 8 is installed on the abutment surface 44. Moreover, the pin 8 protrudes rearward from the pin mounting surface P.

[0102] However, the present invention is not limited thereto, and the pin mounting surface P may also be the support front surface 51. In this case, the pin 8 protrudes forward from the pin mounting surface P. Additionally, in this case, the hole portion 9 may also be provided in the motor 40.

[0103] That is, the pin 8 is installed on the pin mounting surface P which is one of the support front surface 51 and the abutment surface 44, and protrudes forward or rearward from the pin mounting surface P.

[0104] As Figure 4 shown, the pin 8 has a pointed portion 81 and a main body portion 83. The pointed portion 81 is formed at the protruding end of the pin 8. That is, the pointed portion 81 is formed at the protruding end of the pin 8. The pointed portion 81 is formed such that the diameter becomes smaller toward the front end side. The main body portion 83 is formed in a cylindrical shape. The diameter of the main body portion 83 is the same as the diameter of the base end 81a of the pointed portion 81. Additionally, the diameter of the main body portion 83 is substantially the same as the diameter of the hole portion 9. The front end portion (root portion) of the main body portion 83 is fixed in a state of being buried in the motor 40. Additionally, Figure 4 shows the first length L1, the second length L2, and the third length L3.

[0105] The first length L1 is the protruding length of the protruding portion 45. In other words, the first length L1 is the length in the front-rear direction from the abutment surface 44 to the rear end of the protruding portion 45.

[0106] The second length L2 is the length in the front-rear direction from the pin mounting surface P to the base end 81a of the pointed portion 81.

[0107] The third length L3 is the length in the front-rear direction from the pin mounting surface P to the protruding end 82 of the pin 8.

[0108] As Figure 4 shown, the second length L2 is longer than the first length L1. The third length L3 is longer than the second length L2. That is, the third length L3 is longer than the first length L1.

[0109] That is, the length from the pin mounting surface P to the protruding end 82 of the pin 8 is longer than the protruding length of the protruding portion 45. Additionally, the length from the pin mounting surface P to the base end 81a of the pointed portion 81 is longer than the protruding length of the protruding portion 45.

[0110] In Figure 4 shows the motor 40 when the motor 40 is installed on the support member 50. Additionally, in Figure 4 the output shaft 42 is omitted. Additionally, in Figure 4A first position Q1 and a second position Q2 are shown. Both the first position Q1 and the second position Q2 are positions that are closer to the front side than the support front surface 51. The first position Q1 is a position that is closer to the front side than the second position Q2.

[0111] When the motor 40 is mounted on the support member 50, when the rear end of the protruding portion 45 is located at the first position Q1, the position of the protruding end 82 of the pin 8 in the front-rear direction coincides with the position of the support front surface 51 in the front-rear direction. That is, when the motor 40 is mounted on the support member 50, at the moment when the rear end of the protruding portion 45 reaches the first position Q1, the pin 8 starts to enter the hole portion 9. At this moment, the rear end of the protruding portion 45 is located at a position closer to the front side than the support front surface 51. That is, at this moment, the protruding portion 45 has not started to engage with the concave portion 52.

[0112] Moreover, if the motor 40 further approaches the support member 50 and the rear end of the protruding portion 45 is in a state of being located at a position behind the first position Q1 and in front of the second position Q2, the pin 8 becomes a state where it can abut against the hole portion 9. For example, at this time, if the position of the motor 40 in the left-right direction deviates from the appropriate position, the pin 8 abuts against the hole portion 9. As a result, it is possible to prevent the position deviation of the motor 40 in the left-right direction from becoming large.

[0113] In addition, at this time, in a state where the rear end of the protruding portion 45 is located at a position closer to the front side than the support front surface 51, the pin 8 and the hole portion 9 can abut against each other. That is, the positioning mechanism 7 is configured such that when the motor 40 is mounted on the support member 50, in a state where the protruding portion 45 is located at a position closer to the front side than the support front surface 51, the first guide portion 71 and the second guide portion 72 can abut against each other.

[0114] Moreover, when the motor 40 further approaches the support member 50 and the rear end of the protruding portion 45 reaches the second position Q2, as Figure 4 shown by the imaginary line, the position of the base end 81a in the front-rear direction coincides with the position of the support front surface 51 in the front-rear direction. That is, when the motor 40 is mounted on the support member 50, at the moment when the rear end of the protruding portion 45 reaches the second position Q2, the main body portion 83 starts to enter the hole portion 9. In other words, when the motor 40 is mounted on the support member 50, at the moment when the rear end of the protruding portion 45 reaches the second position Q2, the main body portion 83 of the pin 8 starts to engage with the hole portion 9. At this moment, the rear end of the protruding portion 45 is located at a position closer to the front side than the support front surface 51. That is, at this moment, the protruding portion 45 has not started to engage with the concave portion 52.

[0115] Moreover, by the motor 40 further approaching the support member 50, the protruding portion 45 engages with the concave portion 52.

[0116] According to the configuration described above, when the motor 40 is mounted on the support member 50, before the protrusion 45 is engaged with the recess 52, the first guide portion 71 and the second guide portion 72 abut against each other. Thus, the positioning of the motor 40 can be performed. Further, by moving the motor 40 rearward in a state where the first guide portion 71 and the second guide portion 72 are in contact with each other, the protrusion 45 can be engaged with the recess 52 in a state where the motor 40 is positioned relative to the support member 50 when viewed in the front-rear direction. Accordingly, compared with the case where the protrusion 45 is engaged with the recess 52 in a state where the motor 40 is not positioned relative to the support member 50 (a state where the motor 40 is freely movable relative to the support member 50) when viewed in the front-rear direction, it is difficult to cause damage to the surface of the protrusion 45.

[0117] Moreover, according to the configuration described above, the motor 40 is mounted on the support member 50 from the front, and the wiring harness 13 connecting the motor 40 and the inverter 14 is connected to the front portion of the motor 40. Therefore, compared with the case where the wiring harness 13 is connected to the rear portion of the motor 40, the connection portion 41 of the wiring harness 13 in the motor 40 and the wiring harness 13 itself do not easily interfere with the mounting operation of the motor 40 on the support member 50.

[0118] That is, according to the configuration described above, it is possible to realize the following tractor 1: when the motor 40 is mounted on the support member 50, the mounting operation can be smoothly performed, the positioning of the motor 40 can be performed, and it is easy to avoid damage to the surface of the motor 40.

[0119] 〔Other Embodiments〕

[0120] (1) As long as the positioning of the motor 40 relative to the support member 50 can be performed when viewed in the front-rear direction, the first guide portion 71 may not be the pin 8, and the second guide portion 72 may not be the hole portion 9. For example, the first guide portion 71 and the second guide portion 72 may be constituted by a rail and a roller guided by the rail.

[0121] (2) The number of the positioning portions 70 provided in the positioning mechanism 7 may be one.

[0122] (3) The triangle T may be an equilateral triangle.

[0123] (4) All the positioning portions 70 may be arranged at a position above the axis 42a, or may be arranged at a position below the axis 42a.

[0124] (5) The number of the positioning portions 70 arranged at a position above the axis 42a among the plurality of positioning portions 70 may be smaller than the number of the positioning portions 70 arranged at a position below the axis 42a, or may be equal to the number of the positioning portions 70 arranged at a position below the axis 42a.

[0125] (6) The pin 8 may also not form a pointed portion 81.

[0126] (7) In the radial direction of the output shaft 42, the positioning portion 70 may also be located on the outer peripheral side of the fastening device 62.

[0127] (8) The positioning portion 70 may also be arranged on the arrangement circle E.

[0128] (9) The positions and shapes of the protruding portion 45 and the concave portion 52 can be appropriately changed.

[0129] (10) As Figure 6 shown, the support structure of the motor 40 may not be a cantilever structure. In Figure 6 the example shown, a connecting portion 47 and a connecting bolt 48 are provided. The connecting portion 47 is formed by bending a plate material into a channel shape. The connecting portion 47 is connected to the lower surface of the support frame 35 in a state of protruding downward from the lower surface of the support frame 35. The lower surface of the connecting portion 47 abuts against the upper end portion of the housing 46.

[0130] The connecting portion 47 is connected to the upper end portion of the housing 46 by a connecting bolt 48 extending in the vertical direction. With this structure, the motor 40 is supported by the connecting portion 47 and the support member 50.

[0131] An opening 49 is formed in a portion of the support frame 35 above the connecting bolt 48. An operator can perform the tightening operation and the disassembly operation of the connecting bolt 48 by inserting a tool such as a wrench into the opening 49.

[0132] In addition, the components disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be combined and applied with the components disclosed in other embodiments as long as there is no contradiction. In addition, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately changed within the scope not departing from the purpose of the present invention.

[0133] Industrial Applicability

[0134] The present invention can be used not only for tractors but also for various electric work vehicles such as combine harvesters, transplanters, and construction work machines

[0135] 1: Tractor (electric work vehicle)

[0136] 4: Battery

[0137] 7: Positioning mechanism

[0138] 8: Pin

[0139] 9: Hole portion

[0140] 13: Wiring harness

[0141] 14: Inverter

[0142] 40: Motor

[0143] 42: Output shaft

[0144] 42a: Axis center

[0145] 44: Contact surface

[0146] 45: Protrusion

[0147] 50: Support member

[0148] 51: Support front surface

[0149] 52: Recess

[0150] 62: Fastening device

[0151] 70: Positioning part

[0152] 71: First guiding part

[0153] 72: Second guiding part

[0154] 81: Tapered part

[0155] 81a: Base end

[0156] 82: Protruding end

[0157] P: Pin mounting surface

[0158] T: Triangle

Claims

1. An electric work vehicle, characterized in that, it comprises: a battery; a motor, which is supported by a support member and driven by electric power supplied from the battery; an inverter, which converts the DC power from the battery into AC power and supplies it to the motor; and a wiring harness, which connects the front part of the motor to the inverter, and supplies electric power from the inverter to the motor via the wiring harness, the motor is supported by the support member in a state where the output shaft of the motor penetrates the support member and extends rearward, a recess recessed rearward is formed on the front support surface which is the front surface of the support member, the motor has a contact surface that contacts the front support surface and a protruding portion that protrudes rearward from the contact surface and fits into the recess, the protruding portion is made of a first material, the support member is made of a second material having a higher hardness than the first material, it comprises a positioning mechanism, which has a first guiding portion provided on one of the motor and the support member and a second guiding portion provided on the other of the motor and the support member, and positions the motor relative to the support member when viewed in the front-rear direction by the mutual contact of the first guiding portion and the second guiding portion, the positioning mechanism is configured such that when the motor is mounted on the support member, the first guiding portion and the second guiding portion can mutually contact in a state where the protruding portion is located at a position forward of the front support surface.

2. The electric work vehicle according to claim 1, characterized in that, the first guiding portion is a pin extending in the front-rear direction, the second guiding portion is a hole portion that fits with the pin, the positioning mechanism has a plurality of positioning portions, each of the positioning portions respectively includes one corresponding first guiding portion and one corresponding second guiding portion.

3. The electric work vehicle according to claim 2, characterized in that, the positioning mechanism has three or more of the positioning portions.

4. The electric work vehicle according to claim 2 or 3, characterized in that, the positioning mechanism has three of the positioning portions, the three positioning portions are arranged such that when viewed in the front-rear direction, the triangle with the positions of the three positioning portions as vertices is not an equilateral triangle.

5. The electric work vehicle according to any one of claims 2 to 4, characterized in that, the plurality of positioning portions are arranged separately above and below the axis of the output shaft.

6. The electric work vehicle according to claim 5, characterized in that, the number of the positioning portions arranged at a position above the axis is more than the number of the positioning portions arranged at a position below the axis.

7. The electric work vehicle according to any one of claims 2 to 6, characterized in that, the pin is mounted on a pin mounting surface which is one of the front support surface and the contact surface, and protrudes forward or backward from the pin mounting surface, the length from the pin mounting surface to the protruding end of the pin is longer than the protruding length of the protruding portion.

8. The electric work vehicle according to claim 7, characterized in that, A pointed portion is formed at the protruding end of the pin. The length from the pin mounting surface to the base end of the pointed portion is longer than the protruding length of the protruding portion.

9. The electric work vehicle according to any one of claims 2 to 8, characterized in that the pin is mounted on the motor, and the hole portion is provided in the support member.

10. The electric work vehicle according to any one of claims 2 to 9, characterized in that the motor is fastened to the support member by a fastening tool, and in the radial direction of the output shaft, the positioning portion is located on the inner peripheral side of the fastening tool.

11. The electric work vehicle according to any one of claims 1 to 10, characterized in that the motor is supported by the support member in a cantilever shape.

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