JP2013013373A - Electric working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric working vehicle simplifying electric wiring.SOLUTION: The electric working vehicle includes mower motors for driving mower blades traveling motors for rotating rear tires; a mower motor driver 54 controlling the rotation of the mower motors; traveling motor drivers 53L, 53R controlling the rotation of the traveling motors; and a battery 25 supplying electric power to the mower motors and the traveling motors. The battery 25 is separably mounted on the rear part of a chassis 11. A driver section DS for arranging the mower motor driver 54 and the traveling motor drivers 53L, 53R, and a battery section BS for arranging the battery 25, are separately provided, and couplers 51, 52 are further provided for electrically connecting the battery 25 to the motor driver. The couplers 51, 52 are separably formed, and the mower motor driver 54 and the traveling motor drivers 53L, 53R are arranged on the front side of the couplers 51, 52.

Description

  The present invention relates to an electric work vehicle having a working unit and a battery for supplying electric power to the working unit mounted in a detachable manner at the rear part of the machine body.

  Conventionally, a passenger lawn mower (work vehicle) cuts turf (grass) by rotating two mower blades (working section) provided in a mower deck so as to be substantially horizontally rotatable by engine power. And it was comprised so that the cut grass could be discharged toward back.

Japanese National Patent Publication No. 11-509798

  In recent years, from the viewpoint of preventing global warming, the movement to regulate exhaust gases including greenhouse gases has become a social trend. The response to this movement is remarkable in the automobile industry, and so-called eco cars such as hybrid cars and electric cars are being developed. In particular, in recent years, technological development for practical application of electric vehicles using a battery as a power source has been activated.

  However, such technological development is not very active in the field of agricultural machinery. In particular, in the field of riding lawn mowers, there is currently no technical development at a practicable level. Therefore, it is important to develop an electric passenger loan mower.

  In order to realize the electric lawn mower, two mower motors for respectively rotating the two mower blades and two travel motors for driving the left and right rear wheels for traveling are required. In addition, a motor driver for independently controlling these four motors is also required. Therefore, there is a possibility that the electric wiring in the electric lawn mower is complicated. Therefore, the present invention is to provide an electric work vehicle in which electric wiring is simplified.

For this reason, the invention described in claim 1 includes a working unit,
A working unit motor for driving the working unit;
Traveling wheels,
A travel motor for rotating the travel wheels;
A working unit motor driver for controlling rotation of the working unit motor;
A travel motor driver for controlling the rotation of the travel motor;
A battery for supplying electric power to the working unit motor and the traveling motor;
An electric work vehicle in which the battery is detachably mounted at the rear of the fuselage,
A driver section for disposing the working unit motor driver and the traveling motor driver;
A battery section for disposing the battery is separately provided, and
A connecting portion for electrically connecting the battery, the working unit motor driver and the traveling motor driver;
The connecting portion is separable,
The driver section is arranged in front of the connecting portion.

The invention according to claim 2 is the electric work vehicle according to claim 1, further comprising a heat radiating portion for releasing heat generated by the traveling motor driver.
The heat radiating portion protrudes below the body frame.

According to a third aspect of the present invention, in the electric work vehicle according to the first aspect, a driver's seat support frame for mounting the driver's seat is provided on the vehicle body frame,
The driver section is covered with the driver seat support frame.

  According to the first aspect of the present invention, the working unit, the working unit motor that drives the working unit, the traveling wheel, the traveling motor that rotates the traveling wheel, and the operation that controls the rotation of the working unit motor. A motor for driving the motor, a motor for controlling the rotation of the motor, and a battery for supplying power to the working motor and the motor. A working vehicle, comprising: a driver section in which the working unit motor driver and the traveling motor driver are arranged; and a battery section in which the battery is arranged, and further comprising the battery, the working unit motor driver, and the A connecting portion for electrically connecting the traveling motor driver, the connecting portion being formed so as to be separable, and before the connecting portion; It said driver sections are disposed.

  Thereby, a connection part can be arrange | positioned ahead of a battery, the said work part motor driver and the said travel motor driver can be arrange | positioned further ahead of a connection part, and an electric power supply path | route can be simplified. As a result, the motor driver (electrical components) and the battery can be separated from each other at the connecting portion, and the wiring can be simplified. That is, it is possible to provide an electric work vehicle in which electric wiring is simplified.

  According to the second aspect of the present invention, the travel motor driver includes a heat radiating portion for releasing the heat generated by itself, and the heat radiating portion protrudes below the vehicle body frame. Heat generation can be released to the outside of the vehicle, and electrical components can be protected from heat.

  According to the third aspect of the present invention, the driver seat support frame for mounting the driver seat is provided on the vehicle body frame, and the driver section is covered with the driver seat support frame. While being able to protect from dust etc., a working part motor driver and a traveling motor driver can be protected from the impact from the upper part or a side. In addition, since the working unit motor driver and the traveling motor driver are protected using the driver seat support frame, it is not necessary to separately provide a protective member for protecting them, and the number of parts can be reduced.

It is a top view of the electric lawn mower as an example of the riding mower of this invention. It is the side view. It is a schematic side view of a rear part. It is a perspective view of the principal part. It is a perspective view of a chassis. It is a perspective view of a driver's seat support frame. (A) is a schematic plan view which shows the layout of the electrical component of the rear part of an electric lawn mower, (b) is A sectional view taken on the line A of (a). (A) is detail drawing of an electrical equipment section, (b) is B sectional drawing of (a).

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In this specification, “front” refers to the forward direction of the electric work vehicle, “rear” refers to the reverse direction, “left / right” refers to “left / right”, “up / down”, respectively. Each means the “up and down” direction of the electric work vehicle. FIG. 1 is a plan view of an electric lawn mower 10 as an example of the electric work vehicle of the present invention, and FIG. 2 is a side view thereof. The electric lawn mower (electric work vehicle) 10 includes a chassis (body frame) 11, a pair of front tires 12 below the front side of the chassis 11, a pair of rear tires (rear wheels, traveling wheels) 13 below the rear side, and the like. . Further, a mower deck 14 is provided between the front tire 12 and the rear tire 13. The rear side surface of the mower deck 14 is opened to discharge the cut grass to the rear. Inside the mower deck 14, two mower blades (working units) (not shown) are provided side by side. More motors (working section motors) 15 and 15 are attached to the rotation centers of the mower blades (the mower blades are rotated by the mower motor 15 to mow the grass). Note that the rotation center of the right mower blade is slightly rearward in the straight direction as compared with that on the left side.

  A body cover 20 is placed on the chassis 11. The main body cover 20 covers the entire chassis 11. A driver's seat 21 is provided on the main body cover 20 slightly in front of the rear tire 13. On the left and right sides of the driver's seat 21, traveling operation levers 22 and 22 for operating the electric lawn mower 10 are provided. A mower deck adjusting pedal 24 for adjusting the height of the mower deck 14 from the ground is provided on the outer side of the right traveling operation lever 22.

  The electric lawn mower 10 is driven by an electric motor in addition to mowing, and includes a traveling motor 16 inside each of the pair of rear tires 13, 13. Each is driven independently (in addition, a wheel motor may be provided in each of the wheels of the rear tires 13 and 13).

  The electric power of the two mower motors 15 and the two traveling motors 16 is supplied from the battery 25. The battery 25 is provided at the rear of the aircraft. Specifically, the battery 25 is detachably disposed between the axles of the rear tires 13 and 13 and at the rear end of the chassis 11. The battery 25 includes four driven wheels, and is configured such that the battery 25 can be removed and moved by an operator by pushing or pulling. The battery 25 includes a cover, and the power supply port is exposed when the cover lid is opened. Further, a battery controller for correcting minute voltage fluctuations of the battery 25 is provided in the cover.

  A control unit (described later) is provided below the driver seat 21. The control unit is composed of electrical components and includes a motor driver and the like. The motor driver controls the traveling motor 16 of the electric lawn mower 10 and controls the rotational direction and rotational speed of the traveling motor 16 according to the tilting amount of the traveling operation lever 22. Another motor driver controls the rotation of the mower motor 15. These motor drivers include a heat radiating plate (heat radiating portion) at the lower part for releasing the heat generated by the motor driver. The heat radiating plate is disposed so as to be exposed below the chassis 11 (described later). The rotation of the mower motor 15 is controlled so as to be interlocked with the rotation speed of the traveling motor 16. That is, when the traveling speed is increased, the rotational speed of the mower blade is also increased, and when the traveling speed is decreased, the rotational speed of the mower blade is also decreased.

  Each of the front tires 12 and 12 is rotatably attached to the front tire bracket 17 via a shaft (that is, the front tire 12 rotates following the front tire bracket 17). The front tire bracket 17 is formed in a gate shape, and a through hole is provided in the center of the top surface portion. Bolts are passed through the through holes upward and fixed in the cylindrical front tire post 18. As a result, the front tire bracket 17 is rotatable with respect to the front tire post 18.

  One end of the front frame 19 is fixed to the side surface of the front tire post 18. The front frame 19 is formed in an arc shape, and is fixed to the chassis 11 as will be described later.

  The traveling operation lever 22 is provided so as to be tiltable. When the driver tilts the traveling operation lever 22 forward, the traveling motor 16 rotates in the forward direction. On the other hand, when the traveling operation lever 22 is tilted later, the traveling motor 16 rotates in the reverse direction. Furthermore, the rotational speed of the traveling motor 16 changes depending on the tilting degree of the traveling operation lever 22. That is, when the traveling operation lever 22 is largely moved forward (rearward), the traveling motor 16 rotates faster in the forward (reverse) direction, and when the traveling operation lever 22 is moved forward (rearward) smaller, the traveling motor 16 moves forward (rearward). Slowly rotate in the backward direction. The driver can move straight forward, turn left and right, or turn by appropriately operating the traveling operation levers 22 and 22 forward and backward.

  The fender 20FR on the right side of the driver's seat 21 is provided with operation buttons, for example, a mowing switch for turning on and off the two mower blades in the mower deck 14, a height adjusting button for the mower deck 14, etc. Is provided. The mowing switch is a limit type switch, which is turned on when the driver presses it with a finger, and turned off when pressed again. The fender 20FL on the left side of the driver's seat 21 includes a cup folder, a tray for placing small items, and the like. Reference numeral 24 denotes a deck raising / lowering pedal for raising and lowering the mower deck 14. The height of the mower deck 14 can be adjusted by pressing the above-described height adjustment button while operating the deck lifting pedal 24 with the right foot.

  FIG. 3 shows details of attachment of the battery 25 and the chassis (airframe) 11. The battery 25 includes rotating portions 29 on both side surfaces thereof, and handles (gripping portions) 30 are attached so as to connect the rotating portions 29 on both sides thereof. Then, a locking pin 29A is detachably attached to the rotating portion 29. On the other hand, brackets 50 are attached to the rear ends of both sides of the chassis 11. The bracket 50 is formed with a through hole for allowing the locking pin 29A to pass therethrough. The locking pin 29 </ b> A is once removed from the rotating part 29, and the through hole of the bracket 50 and the through hole of the rotating part 29 are aligned. Then, the latch pin 29A is inserted and the battery 25 is attached to the rear end of the chassis 11 (therefore, the battery 25 is detachable from the chassis 11).

  FIG. 4 shows a perspective view of the main part. A driver seat support frame 40 on which the driver seat 21 is placed is mounted on the chassis 11. The driver seat support frame 40 accommodates electrical components such as a control unit. Traveling motors 16 and 16 are attached near the rear end of the chassis 11, and rear tires 13 are attached to the traveling motors 16 via transmission cases, respectively.

  Brackets (front connection portions) 31 and 31 are fixed to the front left and right ends of the chassis 11 with bolts BT1. The tip of the bracket 31 is connected to the front frame 19 by welding or the like.

  The chassis 11 is formed by processing a metal plate, and is formed by integrally forming both side portions 11S and 11S and a central portion 11M provided therebetween as shown in FIG. A notch 11C is formed in the rear part of the central part 11M. This notch 11C is for projecting a heat radiating plate (heat radiating part) included in the motor driver downward. Three through holes 11H1 and two through holes 11H2 are provided on the upper surface of each side portion 11S. Further, three through holes 11H3 are provided on the outer surface of each side portion 11S. The through hole 11H3 is for fixing with the bolt BT1 together with the through hole 31H of the bracket 31 described above.

  The side portion 11S has a substantially gate-shaped cross section. For this reason, the structure of the side part of the chassis 11 can be reduced in weight. Moreover, a harness etc. can be arrange | positioned along the hollow part of the side part 11S.

  As shown in FIG. 6, the driver seat support frame 40 includes a pair of side portions 41, 41, a front portion 42, and a top portion 43, and the side portion 41 and the front portion 42 are connected by a bolt BT <b> 5. The part 41 and the top part 43 are connected by a bolt BT4. As shown in FIG. 7A, the side portion 41 is formed by processing a metal plate, and includes a main body portion 41M and attachment portions 41A, 41B, and 41C. Two through holes 41MH are formed on the front side of the main body 41M. The mounting portion 41A has two through holes 41AH, the mounting portion 41B has two through holes 41BH, the mounting portion 41C has two through holes 41CH1 on the front side, and the mounting portion 41C has three rear holes. Through-hole 41CH2 is formed.

  In the driving support frame 40, as shown in FIG. 7, traveling motor drivers 53L and 53R for independently controlling the left and right traveling motors 16 and 16, and a mower motor for controlling the left and right mower motors 15 and 15, respectively. A control unit such as a driver (working unit motor driver) 54 is provided. These control units are operated by electric power from the battery main body 27. The wiring between the battery body 27 and the control unit is connected via couplers (connection units) 51 and 52. From the coupler 52, the positive electrode wire P1 extends toward the traveling motor driver 53L, and the positive electrode wire P3 extends toward the traveling motor driver 53R and the mower motor driver 54. The positive electrode line P3 enters the electrical component section 57, and on the exit side of the electrical component section 57, the positive electrode line P3 branches and extends into two positive electrode lines P2 and P4. The positive electrode line P2 is connected to the traveling motor driver 53R, and the positive electrode line P4 is connected to the mower motor driver 54.

  The negative electrode line N is distributed by the distribution board 55 and distributed to the negative electrode lines N1, N2, and N3. The negative electrode line N1 is connected to the traveling motor driver 53L, and the negative electrode line N2 is connected to the traveling motor driver 53R. The negative electrode line N3 is connected to the mower motor driver 54. The coupler 51 and the battery body 27 are electrically connected by a single cable that bundles the positive electrode line BP and the negative electrode line BN. A heat sink (heat radiating portion) 54A composed of a plurality of fins is formed below the mower motor driver 54. The heat sink 54A is exposed below the chassis 11 from the notch 11C. For this reason, the heat sink 54A protrudes outside the operation support frame 40 and is exposed to the outside air so as to be easily cooled.

  In this way, the driving support frame 40 is separated into the driver section DS in which the traveling motor drivers 53L and 53R, the mower motor driver 54, and the like are arranged, and the battery section BS in which the battery 25 is arranged. The battery 25 can be separated from the chassis 11. In this case, the battery 25 and the chassis 11 are separated after removing the coupler 51 from the coupler 52. In this example, the couplers 51 and 52 are disposed in the driver section DS. However, the present invention is not limited to this, and the couplers 51 and 52 are disposed between the driver section DS and the battery section BS. You may make it do.

  The electrical component section 57 in the driver section DS is composed of fuses 57A and 57B and relays 57C and 57D as shown in FIG. Two mounting portions 57A1, 57B1, 57C1, and 57D1 are formed in the fuses 57A and 57B and the relays 57C and 57D, respectively, and bolts are fixed between the through holes formed in the central portion 11M of the chassis 11. Is done. On the other hand, in the driver section DS, a cathode distribution plate 55 is disposed on the rear side of the chassis 11 with the mower motor driver 54 interposed therebetween. The distribution plate 55 is provided with four mounting portions 55A, and bolts are fixed between the through holes formed in the central portion 11M of the chassis 11 so as to pass therethrough.

  These attachment portions 57A1, 57B1, 57C1, 57D1, and the attachment method of the attachment portion 55A and the central portion 11M are the same. Here, the attachment method will be described with reference to FIG. The fuse 57A is composed of a fuse body and a plastic case in which the fuse is installed. The plastic case is formed with two mounting portions 57A1 protruding. A through hole is formed in the approximate center of the attachment portion 57A1. A through hole is also formed in the central portion 11M of the chassis 11 corresponding to the through hole, and both the through holes are combined and a bolt BT is inserted and screwed.

  The electrical component section 57 is connected to the positive electrode, and the distribution plate 55 is connected to the negative electrode. Since the electrical component section 57 and the distribution board 55 are arranged on the opposite side across the mower motor driver 54, the bolts are loosened using a spectacle wrench to replace the fuses 57A and 57B and the relays 57C and 57D. At this time, it is possible to prevent the opposite end of the spectacle wrench from coming into contact with the distribution plate 55 and causing a short circuit. Similarly, when the bolts of the distribution plate 55 are loosened, there is an effect of preventing a short circuit.

  In order to surely prevent a short circuit in the driver section DS, the opposite end of the spectacle wrench does not contact the power distribution plate 55 when the spectacle wrench is loosened using the spectacle wrench in the electrical component section 57. A sufficient distance (also a sufficient distance so that the opposite end of the spectacle wrench does not touch the electrical section 57 when the bolt is loosened using the spectacle wrench on the distribution board 55). 57 and the distribution plate 55 are required.

  The present invention is not limited to the above-described example, and can take any form within a scope not departing from the gist of the invention.

  The electric work vehicle of the present invention is not limited to the electric lawn mower, and can be applied to any electric vehicle having a working unit, for example, an electric tractor with a front loader, a four-wheel electric backhoe.

10 Electric loan mower (electric work vehicle)
11 Chassis (body frame)
12 Front tire (front wheel)
13 Rear tire (rear wheel, running wheel)
15 More motor (working section motor)
16 Traveling motor 19 Front frame 21 Driver's seat 25 Battery 40 Driver's seat support frame 51, 52 Coupler
53L, 53R Traveling motor driver 54 More motor driver (working motor driver)
54A heat sink (heat dissipation part)
BS battery section DS driver section

Claims (3)

A working section;
A working unit motor for driving the working unit;
Traveling wheels,
A travel motor for rotating the travel wheels;
A working unit motor driver for controlling rotation of the working unit motor;
A travel motor driver for controlling the rotation of the travel motor;
A battery for supplying electric power to the working unit motor and the traveling motor;
An electric work vehicle in which the battery is detachably mounted at the rear of the fuselage,
A driver section for disposing the working unit motor driver and the traveling motor driver;
A battery section for disposing the battery is separately provided, and
A connecting portion for electrically connecting the battery, the working unit motor driver and the traveling motor driver;
The connecting portion is separable,
An electric work vehicle, wherein the driver section is arranged in front of the connecting portion. The travel motor driver includes a heat dissipating part for releasing heat generated by itself,
The electric work vehicle according to claim 1, wherein the heat radiating portion protrudes below the body frame. A driver's seat support frame for placing the driver's seat is provided on the body frame,
The electric work vehicle according to claim 1, wherein the driver section is covered with the driver seat support frame.

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