JPH0748391Y2 - Industrial robot arm - Google Patents

Description

[Detailed description of the device]

[0001]

[Field of Industrial Application] The present invention relates to an arm of an industrial robot which is used in an environment with a lot of dust and other bad environment.
Particularly, it relates to cooling of the arm driving unit.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the weight of a robot, a plurality of drive motors for driving a wrist portion having a plurality of degrees of freedom of the robot are mounted on one end of an arm. Since it generates a large amount of heat and adversely affects the insulation of the motor and the ICs that make up the control circuit, etc., multiple drive motors are housed in a compartment provided at one end of the arm and are cooled on the side wall of the compartment in the axial direction of the motor. A fan is installed to send cooling air,
It is disclosed that an exhaust slit is provided on a side wall parallel to the axis of the motor to discharge cooling air to cool the drive motor in an open manner (for example, Japanese Utility Model Publication No. 1-23754).
Also, cooling fins are provided on the outer periphery of the drive motor,
It is disclosed that a cooling fan blows cooling air to the outer circumference to cool the outer periphery in a closed manner (for example, Japanese Patent Laid-Open No. 1-920).
No. 86).

[0003]

However, in the above-mentioned open type cooling structure, dust or the like is accumulated on the drive motor in an atmosphere with much dust and the like, and the cooling efficiency is lowered. Further, in the above-mentioned closed cooling structure, the casing portion that houses a plurality of drive motors becomes large, making it difficult to reduce the weight of the arm, and because no ventilation passage is formed, turbulence occurs and noise or cooling is generated. There was a drawback that efficiency decreased. The present invention aims at efficiently cooling a plurality of drive motors.

[0004]

According to the present invention, in an arm of an industrial robot having a plurality of drive motors inside a hermetically sealed frame formed on the arm, a partition is provided between the plurality of drive motors. Through holes are provided at both ends of the partition wall, a circulation fan is attached to the one through hole, and cooling fins are provided inside the frame along a direction in which circulating air flowed by the circulation fan flows.

[0005]

A partition is provided between a plurality of drive motors mounted in a hermetically sealed frame, through holes are provided at both ends of the partition, and a circulation fan is provided in one of the through holes so that one drive motor is connected to the other. Since the air inside the frame is circulated to the drive motor of the, the heat generated from the drive motor is cooled by the circulation air that is made to flow by the circulation fan, and the heat of the circulation air is transferred to the cooling fins fixed to the frame. And is radiated to the outside of the frame.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a cross section of a main part of an embodiment of the present invention, FIG. 2 is a plan cross-sectional view of the main part, and FIG. A wrist portion 3 that tilts with respect to the direction and can rotate about the longitudinal direction is provided. The arm 2 is composed of a box-shaped frame 21 having a space inside, and two drive motors 4 and 5 for tilting and rotating the wrist portion 3 are attached to the inside of a tip portion 22 which is one end of the frame 21. ing. A partition wall 6 is provided between the drive motors 4 and 5, and a tip portion 22 of the partition wall 6 is provided.
Through holes 61 and 62 are provided in the vicinity and in the vicinity of the other end 23. The axial fan 7 is attached to the through hole 62 near the other end 23, and the air inside the frame 21 flows on the surface of the drive motor 4 and is driven through the through hole 61, as shown by the arrow in FIG. A flow of air that circulates on the surface of the motor 5 is returned to the flow axial fan 7. Inside the frame 21, a plurality of cooling fins 8 parallel to the longitudinal direction of the arm are provided to rectify the flow of the circulating air inside the frame 21 and increase the contact area with the circulating air to enhance the cooling effect. is there. Therefore, the heat generated from the two drive motors mounted in the hermetically sealed frame is cooled by the circulating air flowing by the axial fan, and the heat of the circulating air is transferred to the cooling fins fixed to the frame, Heat is dissipated to the outside. Since the frame is hermetically sealed, noise generated from the drive motor transmitted to the outside is extremely small. Further, the number of drive motors is not limited to two, and the circulating fan that generates circulating air in the frame is not limited to the axial fan.

[0007]

As described above, according to the present invention, the internal air is circulated by the circulation fan even when a plurality of drive motors are driven in a closed frame provided on the robot arm. Since it is cooled by the cooling fins provided on the frame, there is an effect that it is possible to provide a robot arm equipped with a drive unit that is compact and has high output with less noise.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a main part of an embodiment of the present invention.

FIG. 2 is a plan sectional view of a main part of the present invention shown in FIG.

FIG. 3 is a front cross-sectional view of a main part along the cross-section of FIG. 2 of the present invention.

[Explanation of symbols]

 1 Robot 2 Arm 21 Frame 3 Wrist Section 4, 5 Drive Motor 6 Partition 61, 62 Through Hole 7 Axial Fan 8 Cooling Fin

Claims (1)

[Scope of utility model registration request] 1. In an arm of an industrial robot having a plurality of drive motors provided inside a hermetically sealed frame formed on the arm, partition walls are provided between the plurality of drive motors, and through holes are provided at both ends of the partition walls. An arm of an industrial robot, wherein a circulating fan is attached to the one through hole, and cooling fins are provided inside the frame along a flowing direction of circulating air flowed by the circulating fan.