JP3340638B2 - Electric transport vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art With the spread of plastic greenhouses, melon cultivation has been actively performed even in cold regions.
Large greenhouse is 50m to allow for great harvest
It is as long as ｍ100 m, and mechanical power is required to move fertilizers, seedlings and crops. Conventionally, a tractor and a cultivator were used. However, since the prime mover was an internal combustion engine (gasoline engine, diesel engine), exhaust gas was trapped in the house, which was not preferable in terms of work environment hygiene. In addition, tractors and cultivators are basically agricultural machines suitable for outdoor work, and therefore have poor maneuverability in a small house.

[0003] Therefore, for example, the use of an "electric transporter" disclosed in Japanese Utility Model Publication No. 51-31502 was examined. As shown in FIG. 1 of the publication, this electric transporter includes electric motors 4, 4 ', front wheels 11, 11' and a carrier frame 1 comprising lower frames 2, 2 'and vertical frames 3, 3'. Rear wheel 1
7, 17 'are attached. Then, as shown in FIG. 2, the front left wheel 11 is driven by the electric motor 4 via the chain and the sprocket, and the front right wheel 11 'is driven by the electric motor 4' via the chain and the sprocket. Wheels 17, 17 ', and a battery 15,
15 ′. The electric motors 4 and 4 ′ are operated by operating a switch box 16 (FIG. 1 of the publication).
The left and right sides are controlled independently, and the aircraft can be turned.

[0004]

The electric carrier disclosed in the above publication has a feature that it does not emit exhaust gas. However, the carrier frame 1 is a sturdy box, and such a carrier frame 1 (vertical frames 3 and 3) is used. The motors 4, 4 'were mounted sideways on'), and the chains and sprockets were arranged. Even in a large greenhouse,
There are a number of restrictions on the traveling of a truck, and the smaller the so-called body weight, the better. This is because if the weight of the vehicle body is small, it is possible to manually correct the direction of the vehicle body. However, such as the electric transport vehicle disclosed in the above-mentioned publication, in which all of the traveling and the direction correction are performed by the electric motors 4 and 4 ', the total weight is too large and it is difficult to manually correct the direction of the vehicle body. There is a limit to the use of.

Specifically, for example, it is convenient if the front wheels can be grounded and the rear wheels can be slightly lifted to finely adjust the vehicle body direction. However, the electric carrier disclosed in the above-mentioned publication has a center of gravity between the front and rear wheels, so that the rear wheels cannot be easily lifted manually. Accordingly, it is an object of the present invention to improve the body frame structure and improve the mounting posture and the mounting position of the electric motor to shift the center of gravity forward to facilitate manual direction correction.

[0006]

In order to achieve the above object, a first aspect of the present invention is to dispose a main frame of a vehicle body frame obliquely in a forward-upward shape, and an electric motor in a state in which an output shaft faces rearward. Characterized in that it is attached to the front of the vehicle.

A heavy electric motor is attached to the tip of the main frame to move the center of gravity forward. As a result, the operation of lifting the rear wheel becomes easy, and fine adjustment of the traveling direction can be easily performed.

When a heavy and large electric motor is mounted on a horizontal main frame, the height of the ground is limited, and the electric motor is more likely to come into contact with a projection on the ground. Therefore, in the present invention, the main frame is arranged at the front. As a result, the height of the electric motor above the ground increases, so that the electric motor hardly comes into contact with the protrusion on the ground, and the carrying operation can be continued.

According to a second aspect of the present invention, the main frame is a single channel or a rectangular frame arranged at the center of the vehicle width. By using a single main frame, the body frame becomes slim, large spaces can be secured on both sides, and a large battery can be stored in these spaces. By making the cross section a channel or a corner, sufficient rigidity can be secured.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. "Left" and "right" are the directions seen from the worker,
“Front” refers to the forward side, and “rear” refers to the opposite side. L is assigned to the left member and R is assigned to the right member.

FIG. 1 is an exploded perspective view of an electric transport vehicle according to the present invention. A vehicle body frame 2 has a channel-shaped main frame 3 having an open lower surface and a torii-type carrier receiving brackets 4, 5 attached thereto. Adopted. The electric carrier 1 has front wheels 9L and 9R mounted on a front portion of the main frame 3 via a gear box 7 and a front axle 8, and an output shaft 11 of an electric motor 10 is inserted into the gear box 7 from the front. Then, the carrier 13 is bolted to the carrier receiving brackets 4 and 5.
(... indicates a plurality).
The left and right operation handles 15L and 15R are attached to the rear of the
6 and further, rear wheels 18L and 18R are mounted on the rear portion of the main frame 3 via a rear axle 17, and the intermediate position of the main frame 3 (front wheels 9L and 9R-rear wheels 18L and 1R).
The battery cages 19L and 19R are arranged between (8R).

FIG. 2 is a side view of the electric transport vehicle according to the present invention, showing that the main frame 3 is tilted in a forward ascending state, and that the motor shaft Lm is offset by δ1 above the front axle 8. . As a result, the height Hm of the electric motor 10 from the ground is substantially the same as the height Hr of the rear axle 17 from the ground.

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2, and shows that the electric motor 10 and the gear box 7 (partly) can be seen between the front wheels 9L and 9R when viewed from the front.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2. The main frame 3 is a channel having an open lower surface. The battery cages 19L, 19B are pivotally mounted on side plates of the main frame 3 via hinges 21, 21. Indicates that 19R was installed. The upper ends of the battery cages 19L and 19R are placed on the loading platform 1.
Can be multiplied by three. When replacing the batteries 21L, 21R, the battery cage 19L,
Rotate 19R sideways around hinges 21 and 21,
Apply the lower corner to the ground as indicated by the imaginary line. That is, the batteries 21L and 21R can be put in and taken out as shown by arrows in a state where they are left on the ground. Since there is no need to support the battery cages 19L and 19R by hand,
The battery 21L (or 21R) can be pulled out with both hands, and workability is improved.

Further, the present invention is characterized in that the main frame 3 is a single channel frame arranged at the center of the vehicle width. By using a single main frame 3, the body frame becomes slim and a large space can be secured on both sides, and the large batteries 21L, 2
1R can be placed. By making the cross section a channel, sufficient rigidity can be ensured.

In order to increase the rigidity, it is more preferable that the main frame 3 has a square (square, vertically long rectangle, horizontally long rectangle) cross section. However, in view of bending rigidity against a downward load and securing of left and right spaces, a vertically long channel frame or a vertically long rectangular section frame is most suitable.

The operation of the electric carrier described above will now be described. In FIG. 2, if the load of the bed 13 and the load is W1, and the load of the batteries 21L and 21R is W2, the center of gravity based on the total load (W1 + W2) is substantially at the position of G2. Assuming that the load of the electric motor 10 is W3 and the load added to the above weight is (W1 + W2 + W3), this load (W1 + W
2 + W3) is approximately G3. In other words, the heavy batteries 21L and 21R generate a clockwise clockwise moment with respect to the front axle 8, whereas the heavy electric motor 10 generates a clockwise counterclockwise moment with respect to the front axle 8, and as a result, the center of gravity G3 becomes It moves forward and becomes almost in the vicinity of the front axle 8. From this, if it is desired to finely adjust the traveling direction, the operator raises the operation handles 15L and 15R, lifts the rear wheels 18L and 18R slightly from the ground, and moves the front wheels 9L and 9R.
What is necessary is just to correct the direction with R as the turning center, and this operation itself is easy.

[0018]

According to the present invention, the following effects are exhibited by the above configuration. According to a first aspect of the present invention, the main frame of the vehicle body frame is disposed obliquely in a forward-upward shape, and the electric motor is mounted on a front portion of the main frame with the output shaft facing rearward. Attach a heavy electric motor to the end of the main frame to move the center of gravity forward. As a result, the operation of lifting the rear wheel becomes easy, and fine adjustment of the traveling direction can be easily performed. When a heavy and large electric motor is mounted on the horizontal main frame, the height above the ground is limited, and the electric motor can easily come into contact with projections on the ground. Therefore, in the present invention, the main frame is arranged at the front. As a result, the height of the electric motor above the ground increases, so that the electric motor hardly comes into contact with the protrusion on the ground, and the carrying operation can be continued.

According to a second aspect of the present invention, the main frame is a single channel or a rectangular frame arranged at the center of the vehicle width. By using a single main frame, the body frame becomes slim, large spaces can be secured on both sides, and a large battery can be stored in these spaces. By making the cross section a channel or a corner, sufficient rigidity can be secured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electric transport vehicle according to the present invention.

FIG. 2 is a side view of the electric transport vehicle according to the present invention.

FIG. 3 is a view taken in the direction of arrow 3 in FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric carrier, 2 ... Body frame, 3 ... Main frame, 4,5 ... Carrier receiving bracket, 8 ... Front axle, 9L,
9R: front wheel, 10: electric motor, 11: output shaft of motor, 13: carrier, 15L, 15R: operation handle, 18
L, 18R: rear wheel, 21L, 21R: battery.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-9-202235 (JP, A) JP-A-10-129492 (JP, A) JP-A-6-71364 (JP, U) JP-A-5-202 63533 (JP, U) Fully open sho 62-72264 (JP, U) Fully open sho 51-302 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62B 3/00 B60K 1 / 00

Claims (2)

(57) [Claims] 1. A vehicle body frame comprising left and right front wheels at a front portion and left and right rear wheels at a rear portion. A carrier is placed above the body frame, and an operation handle is extended obliquely rearward and upward from the carrier, and a vehicle body is provided below the carrier. Left and right 2 between the front and rear wheels on the side of the frame
An electric carrier with an electric motor that directly drives the front wheels at the front of the body frame, comprising:
An electric transport vehicle, wherein a main frame of the vehicle body frame is disposed obliquely in a forward ascending shape, and an electric motor is mounted on a front portion of the main frame with an output shaft facing rearward. 2. The electric transport vehicle according to claim 1, wherein the main frame is a single channel or a rectangular frame arranged at the center of the vehicle width.