JP2001187700A - Battery forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always cool a motor for a working machine so as to prevent the overheating of the motor for working machine by allowing the air cooling a motor for running by a cooling fan of the motor for running to be flown into the motor for the working machine through a duct so as to cool also the motor for the working machine. SOLUTION: This battery forklift is formed so that a battery 2 is mounted on a body 1 and the battery 2 is used as a power source. Also the battery forklift comprises a running motor 12 incorporating a cooling fan 13 for driving front wheels 3 by the power of the battery 2 and a working machine motor 16 incorporating a cooling fan 17 for operating various types of the devices of a working machine 5 by the power of the battery 2, and the air exhaust port 15 of the running motor 12 is connected to the air intake port 18 of the working machine motor 16 through a duct 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery forklift having a battery mounted on a vehicle body and using the battery as a power source to operate a traveling motor for driving driving wheels and various devices in a working machine. And cooling of the working machine motor.

[0002]

2. Description of the Related Art Conventionally, a battery forklift has a battery mounted on a vehicle body, and the battery is used as a power source to drive a front wheel which is a driving wheel, or to tilt a mast or raise and lower a lift bracket along the mast. Various devices were activated. For this reason, a driving motor for receiving the power of the battery is provided behind the axle on the front wheel, and the driving motor drives the front wheel. It should be noted that a cooling fan for cooling the traveling motor itself is built in the traveling motor on the downstream side. Further, a motor for a working machine receiving the power of the battery is provided on one of the left and right frames of the vehicle body, and various devices in the working machine are operated by the motor for the working machine. In addition, a cooling fan for cooling the working machine motor itself is built in the downstream of the working machine motor.

[0003]

In such a conventional battery forklift, a cooling fan is incorporated in each of the traveling motor and the working machine motor in order to prevent heating. Each motor was operated by itself. For this reason, in the traveling motor that is always operating, the cooling fan always operates to always cool the traveling motor, but in the case of the working machine motor that is not operated by the working machine, Since the motor stops, the cooling fan also stops, which makes it impossible to always cool the work machine motor, and causes the work machine motor to heat up and break down, or shorten the life of the work machine motor. Such a problem may occur.

[0004] Therefore, it is conceivable to operate the cooling fan built in the motor for the working machine by another power source. However, if the power source is changed to another power source, the power consumption increases, and the power of the battery mounted on the vehicle body is consumed. In addition to this, there is a problem that the number of components such as a power cord increases and the cost increases.

[0005]

A battery is mounted on a vehicle body, and a battery forklift powered by the battery is provided with a running motor with a built-in cooling fan that drives driving wheels by the power of the battery. And a work machine motor with a built-in cooling fan that activates various devices in the work machine by the power of the battery, and an air exhaust port in the travel motor and an air intake port in the work machine motor are connected by a duct. It is a battery forklift connected.

[0006]

[Work] The air cooled by the cooling fan of the running motor flows into the working machine motor through the duct, and the working machine motor is also cooled. It can be cooled and prevents heating of the work machine motor, eliminating failures and shortening the service life.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a battery forklift according to the present invention will be described. As shown in FIG. 1, the battery forklift has a battery 2 mounted on a vehicle body 1 and includes a front wheel 3 as a driving wheel and a rear wheel 4 as a steering wheel, and a work machine 5 is mounted on a front portion of the vehicle body 1. are doing. The work machine 5 includes a pair of left and right masts 6 that can be tilted back and forth, and a lift bracket 7 that can be moved up and down along the mast 6 is attached, and left and right forks 8 are mounted on the lift bracket 7. Configuration,
Various devices in the working machine 5 include a tilt cylinder 9 for tilting the mast 6 and a lift cylinder 10 for raising and lowering the lift bracket 7 and the fork 8. These various devices are operated by the hydraulic pump 11. Was supposed to.

In such a battery forklift, a traveling motor 12 for receiving the power of the battery 2 mounted on the vehicle body 1 is provided. The traveling motor 12 is provided laterally behind the axle of the front wheels 3 (in the lateral direction of the vehicle body). As a result, the front wheels 3 are driven, and a cooling fan 13 for cooling the traveling motor 12 itself is incorporated on the downstream side. By forming a suction port 14 and incorporating a cooling fan 13 on the right side of the vehicle body 1 on the opposite side and forming an air discharge port 15, air flows in from the air suction port 14 and flows through the traveling motor 12. The air is discharged from the air outlet 15 by the cooling fan 13.

On the other hand, a work machine motor 16 for receiving the power of the battery 2 mounted on the vehicle body 1 is provided. The work machine motor 16 is provided forwardly on one of the right and left frames of the vehicle body 1, The hydraulic pump 11 which is an operation source of various devices in the working machine 5 is operated, and a cooling fan 17 for cooling the working machine motor 16 itself is provided on the downstream side. An air intake port 18 is formed on a front side surface of the work machine motor 16 provided with the cooling fan 17.
Is built in and the air outlet 19 is formed, so that air flows in from the air inlet 18, flows through the work machine motor 16, and is discharged from the air outlet 19 by the cooling fan 17.

[0010] In the traveling motor 12 and the work machine motor 16, the duct 20 which is oriented laterally (in the left-right direction of the vehicle body 1) over the entire surface of the air discharge port 15 disposed on the right side of the vehicle body 1 in the traveling motor 12. And the other end of the duct 20 is attached to the entire surface of the air intake port 14 arranged on the front side surface of the work machine motor 16, and the air exhaust port 15 of the travel motor 12 is attached.
And an air suction port 18 of the working machine motor 16 are connected by a duct 20. The shape of the duct 20 may be a bellows shape as shown in FIG. 2 (a), a quadrangular truncated pyramid tube shape as shown in FIG. 2 (b), or FIG. As shown in c), the shape may be a stepped frustoconical cylinder, and the shape is not limited to these, and any structure having a structure that reliably sends air may be used.

The air for cooling the traveling motor 12 and the work machine motor 16 first flows through the air suction port 14 on the left side of the vehicle body 1 in the traveling motor 12 and flows through the inside of the traveling motor 12 on the left side of the vehicle body 1. From the air outlet 15 on the left side of the vehicle body 1 by the cooling fan 13,
The discharged air flows through the duct 20, flows in from the front air suction port 18 in the work machine motor 16, flows from the front to the rear in the work machine motor 16, and flows through the rear air discharge port 19 from the vehicle body. 1 is discharged to the rear.

As described above, in the traveling motor 12 and the working machine motor 16, when both the traveling motor 12 and the working machine motor 16 are operating, air is flown by the respective cooling fans 13 and 17. Thus, the traveling motor 12 and the work machine motor 16 are cooled. When the work machine motor 16 stops, the work machine motor 16
Of the traveling motor 12 is stopped by the cooling fan 13 of the traveling motor 12.
The cooled air is passed through the duct 20 to the working machine motor 16.
And the working machine motor 16 is also cooled. Thereby, even if the work machine motor 16 is stopped, the work machine motor 16 can be cooled. By constantly cooling the work machine motor 16, the heating of the work machine motor 16 is prevented, It is possible to eliminate a failure and a shortened life. In addition, there is no need to operate the cooling fan 17 built in the work machine motor 16 by another power supply,
It is also possible to prevent an increase in power consumption and an increase in the number of components such as a power cord. Further, by connecting the duct 20 to the air outlet 15 of the traveling motor 12, that is, the downstream side of the traveling motor 12, the occurrence of turbulence in the traveling motor 12 is suppressed, and Can be brought into a clear stream, and the cooling effect of the traveling motor 12 can be greatly improved.

The attachment of the traveling motor 12 and the working machine motor 16 to the vehicle body 1 is not limited to the above-described one.
In this case, the duct 20 extends forward and backward in the frame of the vehicle body 1 so that the air exhaust port 15 of the traveling motor 12 and the working machine motor 16 are provided.
And the air intake port 18 at the same time.

[0014]

According to the present invention, the air cooled by the cooling fan of the running motor flows into the working machine motor through the duct, and the working machine motor is also cooled. Cooling can be performed at all times, and the heating of the work machine motor is prevented, preventing failure and shortening of service life. Moreover, there is no need to operate the cooling fan built into the work equipment motor with a separate power supply,
An increase in power consumption and an increase in the number of components such as a power cord can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a battery forklift according to the present invention.

FIG. 2 (a) is an explanatory view showing the shape of a duct in a battery forklift according to the present invention. (B) It is explanatory drawing which shows the shape of the duct in the battery forklift by this invention. (C) It is explanatory drawing which shows the shape of the duct in the battery forklift by this invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Battery, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Work machine, 6 ... Mast, 7 ... Lift bracket, 8 ... Fork, 9 ... Tilt cylinder, 10 ... Lift cylinder, 11
... Hydraulic pump, 12 ... Running motor, 13 ... Cooling fan, 14 ... Air intake port, 15 ... Air exhaust port, 16 ... Work machine motor, 17 ... Cooling fan, 18 ... Air intake port, 1
9 ... air outlet, 20 ... duct.

Claims (1)

[Claims] 1. A traveling motor 12 with a built-in cooling fan 13 for mounting a battery 2 on a vehicle body 1 and driving a driving wheel by the power of the battery 2 in a battery forklift powered by the battery 2. And a work machine motor 16 with a built-in cooling fan 17 for operating various devices in the work machine 5 by the power of the battery 2, and an air discharge port 15 in the travel motor 12 and a work machine motor. 16 air inlet 1
A battery forklift, wherein the battery forklift is connected to the battery forklift by a duct.