Work vehicle

Abstract

To provide a working vehicle in which members are efficiently arranged by effectively utilizing a space.SOLUTION: A working vehicle is provided with a pair of right and left front wheels 2 in a front part of a traveling vehicle body 1, a pair of right and left rear wheels 3 in a rear part of the traveling vehicle body 1, a working machine 4 in the traveling vehicle body 1, and an electric motor 30 for driving the rear wheels 3. A gear box 31 for decelerating output rotation of a first output shaft 30A and switching a rotation direction thereof is provided on one side of the right and left of the electric motor 30. The rear wheels 3 and the gear box 31 are connected by a drive shaft 33. The drive shaft 33 is provided below the electric motor 30. A second output shaft 40A extending in a front-rear direction, and transmitting power to the working machine 4 is provided between the electric motor 30 and the drive shaft 33. In a planar view, the second output shaft 40A and the drive shaft 33 intersect with each other.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a work vehicle that travels in a park or the like and mows grass or the like.

Background Art

[0002] Conventionally, a work vehicle is known to have an engine mounted on a bonnet portion and transmit the output rotation of the engine to a work machine such as a mower deck that is supported so as to be movable up and down on the rear wheels or the lower part of the work vehicle for driving. (Patent Document 1)

[0003] Also, a work vehicle is known to have a battery mounted on the rear part of the work vehicle, supply the power of the battery to an electric motor, and transmit the output rotation of the electric motor to a work machine such as a mower deck that is supported so as to be movable up and down on the rear wheels or the front part of the work vehicle for driving. (Patent Document 2)

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the means of Patent Document 1, the configuration of the transmission equipment for transmitting the output rotation of the engine to the rear wheels or the work machine was complicated and the number of parts was large.

[0006] Also, in the means of Patent Document 2, a battery is mounted on the rear part of the work vehicle, and it has a motor for driving the front wheels and a motor for driving the rear wheels. In order to apply it to a small work vehicle, it was necessary to arrange each component efficiently.

[0007] Therefore, the present invention provides a work vehicle in which members are efficiently arranged by effectively utilizing space.

Means for Solving the Problems

[0008] The present invention that solves the above problems is as follows.

[0009] A pair of left and right front wheels (2) are provided at the front of the traveling vehicle body (1), A pair of left and right rear wheels (3) are provided at the rear of the traveling vehicle body (1), On the traveling vehicle body (1) Mow weeds such as lawn A working machine (4) is provided, In the working vehicle provided with the A first electric motor (30) and a second electric motor (40) for driving a work implement (4) rear wheels (3) being driven, On one side of the left and right of the electric motor (30), a gearbox (31) for reducing the output rotation of the first output shaft (30A) and switching the rotation direction is provided, The rear wheel (3) and the gearbox (31) are connected by a drive shaft (33), A drive shaft (33) is provided below the first electric motor (30) and extends in the front-rear direction to the working machine (4) Of the second electric motor (40) A second output shaft (40A) for transmitting power is provided between the First electric motor (30) and the drive shaft (33), The second electric motor (40) is arranged behind the drive shaft (33), A working vehicle characterized in that the second output shaft (40A) and the drive shaft (33) intersect in a plan view.

[0010] The invention according to claim 2 is The first output shaft (30A) and the drive shaft (33) are provided so as to extend in the left-right direction, and the second output shaft (40A) is provided so as to extend in the front-rear direction A working vehicle according to claim 1, characterized in that.

[0011] The invention according to claim 3 is, in a rear view, the Recording electricity motor (30) and The gearbox (31) are provided offset to one side in the left-right direction, By the work implement (4) A shooter (46) for conveying the cut grass to the grass collecting container (7) is provided on the Recording electricity other side of the motor (30) and The gearbox (31) A working vehicle according to claim 1 or claim 2, characterized in that.

Effects of the Invention

[0012] According to the above invention, Effectively utilize space and efficiently arrange members It is possible.

Brief Description of the Drawings

[0013]

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Embodiments for Carrying Out the Invention

[0014] As shown in Fig. 1, a work vehicle such as a riding lawn mower includes a traveling vehicle body 1, a pair of left and right front wheels 2 provided at the front of the traveling vehicle body 1, a pair of left and right rear wheels 3 provided at the rear of the traveling vehicle body 1, and a working machine 4 for mowing grass and the like provided between the front wheels 2 and the rear wheels 3 on the lower side of the traveling vehicle body 1. Further, a bonnet portion 5 is provided at the front upper side of the traveling vehicle body 1, a control portion 6 where an operator boards is provided at the rear side of the bonnet portion 5, and a grass collection container 7 for storing grass and the like cut by the working machine 4 is provided at the rear side of the control portion 6.

[0015] As shown in Figs. 2 and 3, the bonnet portion 5 is provided with a battery 50 for storing electric power to be supplied to an electric motor 30 or the like that drives the rear wheels 3, and the battery 50 is covered with a bonnet cover 51. The bonnet cover 51 is supported by a support shaft (not shown) extending in the left-right direction provided at the front portion of the traveling vehicle body 1. Thereby, the space formed in the bonnet portion 5 can be effectively utilized, and the difference in the weight balance in the front-rear direction of the work vehicle can be suppressed.

[0016] An electrical component 61 is provided below the driver's seat 60 of the control portion 6. Thereby, the space formed below the driver's seat 60 can be effectively utilized.

[0017] As shown in Figs. 4 to 7, below the electrical component 61, an electric motor 30 such as a synchronous motor or an induction motor operated by a three-phase AC voltage waveform that drives the rear wheels 3 is provided. The output shaft (the "first output shaft" in the claims) 30A formed to extend in the left-right direction of the electric motor 30 is connected to the upper portion of a gear box 31 that decelerates the output rotation transmitted from the output shaft 30A to increase the output torque or reverse the rotation direction. The electric motor 30 is provided at a position offset to the left side from the center in the left-right direction.

[0018] The output rotation speed increased or decreased by the gearbox 31 is transmitted to a drive shaft 33 extending in the left-right direction via a differential gear 32 formed by a differential gear or the like provided at the lower part of the gearbox 31. The output rotation transmitted to the drive shaft 33 is transmitted to rear wheels 3 supported at both ends of the drive shaft 33.

[0019] Below the electric motor 30, an electric motor 40 such as a synchronous motor or an induction motor operated by a three-phase AC voltage waveform for driving the working machine 4 is provided. An output shaft (the "second output shaft" in the claims) 40A formed to extend in the front-rear direction of the electric motor 40 is connected to the rear part of a universal joint 41 provided to extend in the front-rear direction. Further, the output shaft 40A is provided above the drive shaft 33 and orthogonal to the drive shaft 33. Thereby, the space formed below the electric motor 30 can be effectively utilized. Also, since the transmission path between the electric motor 40 and the working machine 4 can be shortened, the output rotation of the electric motor 40 can be efficiently transmitted to the working machine 4. Note that the electric motor 40 is provided at a position shifted to the left from the center in the left-right direction.

[0020] The front part of the universal joint 41 is connected to a gearbox 42 that decelerates the output rotation transmitted from the universal joint 41 and increases the output torque. The output rotation transmitted to the gearbox 42 is transmitted to a left cutting blade (not shown) provided in a left discharge passage 45L of the working machine 4 via an output shaft formed to extend in the up-down direction of the gearbox 42.

[0021] A connecting member 43 extending in the left-right direction is connected to the left part of the gearbox 42, and the right part of the connecting member 43 is connected to a gearbox 44. The output rotation transmitted to the gearbox 44 is transmitted to a right cutting blade (not shown) provided in a right discharge passage 45R of the working machine 4 via an output shaft formed to extend in the up-down direction of the gearbox 44. Note that the rotational speeds of the output rotations of the output shaft of the gearbox 42 and the output shaft of the gearbox 44 are the same, and the rotational directions are opposite, that is, in a plan view, the output shaft of the gearbox 42 rotates clockwise and the output shaft of the gearbox 44 rotates counterclockwise.

[0022] The discharge ports of the left discharge passage 45L and the right discharge passage 45R are connected to the inlet of a shooter 46 that conveys the mown turf or the like to a grass collecting container 7. The discharge port of the shooter 46 is connected to the inlet of the grass collecting container 7.

[0023] In plan view, the front portion of the shooter 46 is provided on the right side of the universal joint 41, and the rear portion of the shooter 46 is provided on the right side of the gear box 31. In rear view, the shooter 46 and the grass collecting container 7 are provided between the gear box 31 and the right rear wheel 3. Thereby, a large shooter 46 can be provided in the space formed on the right sides of the universal joint 41 and the gear box 31, and the turf or the like cut by the working machine 4 can be efficiently conveyed to the grass collecting container 7.

[0024] In side view, the upper wall of the shooter 46 is formed with a rearward upward slope, and the rear portion of the shooter 46 is provided so as to extend downward below the electrical components 61. Thereby, the rear portion of the shooter 46 can be enlarged to prevent clogging of the turf or the like inside the shooter 46.

[0025] As shown in FIGS. 8 and 9, the traveling vehicle body 1 is formed by a traveling vehicle body main body 10 that supports front wheels 2 and rear wheels 3, and a steering post 11 that supports a steering shaft 63.

[0026] A left front-rear frame 10L and a right front-rear frame 10R extending in the front-rear direction are formed on the traveling vehicle body main body 10, and a left connecting portion 11L and a right connecting portion 11R extending forward are formed at the lower portion of the steering post 11.

[0027] The left connecting portion 11L is fixed to the left front-rear frame 10L by fastening means such as bolts, and the right connecting portion 11R is fixed to the right front-rear frame 10R by fastening means such as bolts to be integrated to form the traveling vehicle body 1.

[0028] A left support member 12L is provided at the front part of the left front and rear frame 10L, and the connecting part of the left support member 12L is formed with an upward left inclination. Also, a right support member 12R is provided at the front part of the right front and rear frame 10R, and the connecting part of the right support member 12R is formed with an upward right inclination. Note that the left support member 12L and the right support member 12R are formed of channel steel materials.

[0029] A left support member 13L is provided at the front part of the left connecting part 11L, and the connecting part of the left support member 13L is formed with an upward left inclination. Also, a right support member 13R is provided at the front part of the right connecting part 11R, and the connecting part of the right support member 12R is formed with an upward right inclination. Note that the left support member 13L and the right support member 13R are formed of channel steel materials.

[0030] At the lower part of the steering post 11, a protruding part 14 is formed to protrude forward at a predetermined interval in the left - right direction, and a buffer member 15 formed of a rubber member or the like is provided at the tip of the protruding part 14.

[0031] As shown in FIG. 10, the lower part of the battery 50 provided in the bonnet part 5 is fitted inside the inner peripheral part of the battery bracket 52. The battery 50 is formed by connecting a plurality of high - energy - density lithium - ion batteries in series and in parallel. Thereby, the space formed in the bonnet part 5 can be effectively utilized. Also, since the lithium - ion battery has a high energy density, the work vehicle can travel a long distance with a single full charge.

[0032] As shown in FIG. 11, the battery bracket 52 is formed by a left front - and - rear frame 52L and a right front - and - rear frame 52R extending in the front - rear direction, a front left - and - right frame 52A connecting the front parts of the left front - and - rear frame 52L and the right front - and - rear frame 52R, and a rear left - and - right frame 52B connecting the rear parts of the left front - and - rear frame 52L and the right front - and - rear frame 52R. Note that the left front - and - rear frame 52L and the right front - and - rear frame 52R are formed of angle steel materials, and the front left - and - right frame 52A and the rear left - and - right frame 52B are formed of channel steel materials.

[0033] The connecting portion of the left front-rear frame 52L is formed with an upward slope to the left, and the connecting portion of the right front-rear frame 52R is formed with an upward slope to the left. In a rear view, the upward slopes of the connecting portion of the left support member 13L, the connecting portion of the left support member 12L, and the connecting portion of the left front-rear frame 52L are formed at the same inclination angle, and the upward slopes of the connecting portion of the right support member 12R, the connecting portion of the right support member 12R, and the connecting portion of the right front-rear frame 52R are formed at the same inclination angle.

[0034] On the lower surface of the connecting portion of the left front-rear frame 52L, round left anti-vibration members 53L are provided at a predetermined interval in the front-rear direction, and on the lower surface of the connecting portion of the right front-rear frame 52R, round right anti-vibration members 53R are provided at a predetermined interval in the front-rear direction.

[0035] The left front-rear frame 52L is connected to the left support member 12L of the left front-rear frame 10L and the left support member 13L of the left connecting portion 11L via the left anti-vibration member 53L, and the right front-rear frame 52R is connected to the right support member 12R of the right front-rear frame 10R and the right support member 13R of the right connecting portion 11R via the right anti-vibration member 53R. Thereby, it is possible to suppress the vibration of the traveling vehicle body main body 10 generated during the traveling of the work vehicle from being transmitted to the battery 50 and prevent damage to the battery 50 and the like.

[0036] As shown in FIG. 12, the connecting portion of the left front-rear frame 52L is provided orthogonally to a left virtual line 55L connecting the center of the left anti-vibration member 53L and the center of the left front wheel 2L on the left side. Further, the connecting portion of the right front-rear frame 52R is provided orthogonally to a right virtual line 55R connecting the center of the right anti-vibration member 53R and the center of the right front wheel 2R on the right side. Thereby, it is possible to suppress large vibrations caused by the unevenness of the traveling surface via the front wheels 2 and the rear wheels 3 and prevent damage to the battery 50 and the like. Note that reference numeral 57 indicates a front wheel support frame that supports the left and right front wheels 2, reference numeral 56 indicates a connecting portion between the front wheel support frame and the traveling vehicle body main body 10, and indicates the swing axis of the front wheel support frame.

[0037] Further, the tip of the buffer member 15 of the steering post 11 is pressed against the rear surface of the rear left and right frames 52B of the battery bracket 52. Thereby, when the work vehicle starts, the movement of the battery 50 backward can be suppressed, and damage to the battery 50 and the like can be prevented.

[0038] As shown in FIGS. 2 and 3, a steering wheel 62 is provided on the front side of the driver's seat 60 of the control unit 6, and the steering wheel 62 is supported on the upper part of a steering shaft 63 extending in the vertical direction.

[0039] A cleaner lever 65 for operating the conveyance of the mowed grass remaining inside the shooter 46 to the rear grass collection container 7 and the like is provided on the left fender 64L on the left side of the driver's seat 60, and an operation lever 66 for operating the raising and lowering of the work implement 4 and the like is provided on the fender 64R on the right side of the driver's seat 60. Further, a brake pedal 68 is provided at the left front part of the floor 67 on which the operator places his / her feet during operation, and a forward accelerator pedal 75 and a reverse accelerator pedal 76 are provided side by side at the right front part.

[0040] As shown in FIGS. 13 and 14, the electrical components 61 provided below the driver's seat 60 are composed of an inverter device 80 that converts the DC voltage supplied from the battery 50 into an AC voltage and generates a three-phase AC voltage waveform for operating the motor 30 and the like, a battery monitoring device 81 that monitors the temperature, charge state, voltage protection, and short-circuit state of each cell of the battery 50, an auxiliary battery 82 such as a lead-acid battery that stores electricity for supplying to a meter panel (not shown) that displays the traveling speed and the like provided on the front side of the driver's seat 60, and a converter device 83 that changes the DC voltage supplied from the battery 50 into a DC voltage for supplying to a sensor that detects the operation position of the cleaner lever 65 and the like.

[0041] The inverter device 80 is formed by an inverter device 84 that operates the motor 30 and an inverter device 85 that operates the motor 40. Further, when the regenerative brake is operating, that is, when the forward accelerator pedal 75 or the reverse accelerator pedal 76 is released and the output shaft 30A rotates due to the inertial force of the traveling vehicle body 1 and the motor 30 operates as a generator, the inverter device 80 also has a function as a charging device that charges the battery 50 with the power supplied from the motor 30.

[0042] In a plan view, the inverter device 80 is provided at the front part below the driver's seat 60, and a battery monitoring device 81 is provided at the rear side of the inverter device 80. Further, an auxiliary battery 82 is provided on the left side of the inverter device 80, and a converter device 83 is provided at the rear side of the auxiliary battery 82 and on the left side of the battery monitoring device 81. Thereby, the space formed below the driver's seat 60 can be effectively utilized. Also, by providing the heavy battery monitoring device 81 at the rear side, the difference in weight applied to the front part and the rear part of the traveling vehicle body main body 10 can be suppressed, and the traveling stability performance can be improved.

[0043] As shown in FIG. 15, round grommets 86 are provided on the inner surfaces of the left wall and the right wall of the housing 80A of the inverter device 80 at predetermined intervals in the front-rear direction. Further, the housing 80A is connected to left and right frames 16 extending in the left-right direction provided at the rear part of the traveling vehicle body main body 10 via the grommets 86. Thereby, it is possible to suppress the vibration of the traveling vehicle body main body 10 generated during the traveling of the work vehicle from being transmitted to the inverter device 80 and prevent damage to the inverter device 80 or the like. Also, wires or the like connecting the inverter device 80 and the motor 30 can be inserted through the hollow portions formed in the grommets 86, and the routing of the wires or the like can be easily performed.

[0044] As shown in Fig. 16, round grommets 87 are provided on the lower wall of the housing 81A of the battery monitoring device 81 at predetermined intervals in the front-rear direction and the left-right direction. Further, the housing 81A is connected to a support frame 18 that is connected to left and right frames 17 provided on the rear side of the left and right frames 16 via the grommets 87. Thereby, it is possible to suppress the vibration of the traveling vehicle body main body 10 generated during the traveling of the work vehicle from being transmitted to the battery monitoring device 81, and prevent damage to the battery monitoring device 81 and the like. Further, wires and the like connecting the battery monitoring device 81 and the battery 50 can be inserted through the hollow portions formed in the grommets 87, and the routing of the wires and the like can be easily performed.

[0045] As shown in Figs. 17 and 18, the electric cylinder 70 and the brake 71 provided on the rear wheel 3 are connected by a rod 72 extending in the front-rear direction. Note that the rod tip of the electric cylinder 70 and the rod 72 are connected by a connecting member 73.

[0046] When a brake switch (not shown) provided on the operation unit 6 is turned ON, the rod of the electric cylinder 70 contracts, moves the rod 72 forward, operates the brake 71, and stops the drive of the rear wheel 3. Thereby, in an emergency, the brake switch can be turned ON to drive the electric cylinder 70 to urgently stop the traveling of the work vehicle.

[0047] When the brake switch is turned OFF, the rod of the electric cylinder 70 extends, moves the rod 72 backward, stops the operation of the brake 71, and drives the rear wheel 3.

[0048] The front side portion of the rod 72 is connected to the rear portion of the brake pedal 68. When the brake pedal 68 is depressed, the brake pedal 68 rotates counterclockwise about a support shaft 68A extending in the left-right direction, and the rod 72 can be moved forward. Thereby, even when the electric cylinder 70 fails to operate, the brake pedal 68 can be depressed to operate the brake 71, improving safety.

[0049] Also, when the depression of the brake pedal 68 is stopped, the brake pedal 68 rotates clockwise about the support shaft 68A by a pulling means 69 such as a spring provided below the brake pedal 68, moves the rod 72 rearward, stops the operation of the brake 71, and can drive the rear wheel 3.

Explanation of Signs

[0050] 1 Traveling vehicle body 2 Front wheel 3 Rear wheel 4 Working machine 5 Bonnet part 6 Control part 7 Grass collecting container 30 Electric motor (first electric motor) 30A Output shaft (first output shaft) 31 Gear box 33 Drive shaft 40 Electric motor (second electric motor) 40A Output shaft (second output shaft) 46 Shooter 50 Battery 60 Operator's seat 80 Inverter device 80A Housing (first housing) 81 Battery monitoring device 81A Housing (second housing) 86 Grommet (first vibration-proof member) 87 Grommet (second vibration-proof member)

Claims

1. A pair of left and right front wheels (2) are provided at the front of a traveling vehicle body (1), A pair of left and right rear wheels (3) are provided at the rear of the traveling vehicle body (1), A working machine (4) for mowing weeds such as turf is provided on the traveling vehicle body (1), In a working vehicle provided with a first electric motor (30) for driving the rear wheels (3) and a second electric motor (40) for driving the working machine (4), A gearbox (31) for reducing the output rotation of the first output shaft (30A) and switching the rotation direction is provided on one left and right side of the electric motor (30), The rear wheel (3) and the gearbox (31) are connected by a drive shaft (33), A drive shaft (33) is provided below the first electric motor (30), and a second output shaft (40A) that extends in the front-rear direction and transmits the power of the second electric motor (40) to the working machine (4) is provided between the first electric motor (30) and the drive shaft (33), The second electric motor (40) is arranged behind the drive shaft (33), and the working vehicle is characterized in that the second output shaft (40A) and the drive shaft (33) intersect in a plan view.

2. The working vehicle according to claim 1, wherein the first output shaft (30A) and the drive shaft (33) are provided to extend in the left-right direction, and the second output shaft (40A) is provided to extend in the front-rear direction.

3. In a rear view, the electric motor (30) and the gearbox (31) are provided offset to one side in the left-right direction, The working vehicle according to claim 1 or claim 2, wherein a shooter (46) for conveying the grass cut by the working machine (4) to a grass collecting container (7) is provided on the other side of the electric motor (30) and the gearbox (31).

Images