JP4583161B2 - Dust diffusion prevention device for actuator - Google Patents

Description

  The present invention relates to a dust diffusion preventing device in an actuator that can prevent a problem that dust generated from the inside of an actuator flows out of the actuator and contaminates an indoor space.

Conventionally, in an actuator such as a motor, a bearing that supports an output shaft is provided on the inner wall surface of the actuator, and this bearing generates wear powder when the output shaft rotates, or oil such as grease filled in the bearing portion. There was a problem that the mist flowed out from the outlet hole of the output shaft with the rotation of the output shaft.
For this reason, in the field where work in a clean room such as a semiconductor factory is essential, it is necessary to suppress the diffusion of dust flowing out from the actuator as much as possible.

Therefore, conventionally, it is known that the entire motor is confined in the case to suppress the generation of dust, or a fan is provided in the case in which the entire motor is placed to exhaust the dust flowing out of the motor out of the case. (See Patent Document 1).
JP 62-293951 A

  However, according to the above prior art, since the entire motor is confined in the case, the entire apparatus is enlarged, and the structure for incorporating the fan into the case is complicated.

  An object of the present invention is to solve the above-mentioned problems and to provide a dust diffusion preventing device in an actuator that can reduce the size of the entire device.

In order to solve the above problems, the present invention is an apparatus for preventing the diffusion of dust flowing out from the hole of the actuator case that pulls out the output shaft of the actuator to the outside. In this adapter, an exhaust device that forcibly exhausts the dust flowing into the inner cavity of the adapter together with the internal air of the adapter is connected.
Further, the present invention is the adapter, and a recess on the inside of the upper Symbol tabular body formed in a shape corresponding to the end surface of the actuator case constitutes the center of the bottom surface of the recess of the adapter, Forming a hole for pulling out the output shaft of the actuator to the outside, opening the other end of the exhaust passage through the thick part of the main body and opening one end to the inner wall surface of the recess to the side surface of the main body, An arc-shaped projection is formed on the bottom surface of the recess of the adapter along the inner wall surface of the recess so as to be continuous at a constant interval in the circumferential direction. formed to be shifted from the opening position of the end, in the open position, it lies in the connecting suction pump for evacuating the interior cavity between the end surface of the recess and the upper Symbol actuator case.

  According to the present invention, the structure of the entire apparatus can be reduced in size, and the number of parts can be set to a minimum.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partial cross-sectional view showing a dust diffusion preventing device in an actuator.
In FIG. 1, reference numeral 1 denotes a motor as an actuator. In the motor 1, a rotor 3 is housed in a motor case 2 together with a stator (not shown). An output shaft 4 that supports the rotor 3 is supported via a bearing 5 provided in the motor case 2.
One end of the output shaft 4 is drawn out of the motor case 2 from an output shaft lead-out hole 6 a provided in the flange 6 of the motor case 2.

  Reference numeral 7 denotes a dust diffusion prevention device assembled to the flange 6 of the motor 1. The dust diffusion prevention device 7 is composed of an adapter 8 attached to the flange 6 and an exhaust device 9 for exhausting the internal air of the adapter 8. Yes.

  As shown in FIG. 2, the adapter 8 is formed by forming a shallow cylindrical recess 10a inside a flat plate-like main body 10 corresponding to the flange 6 of the motor 1, and outputs it to the center of the bottom surface 10e of the recess 10a. A lead hole 10b of the shaft 4 is formed. Holes 10c corresponding to mounting holes (not shown) of the flange 6 of the motor 1 are formed at the four corners of the main body 10. The adapter 8 is fixed to the mounting hole of the flange 6 of the motor 1 through a screw (not shown) in the hole 10c. A projecting piece 11 protruding outward is integrally formed on one side of the main body 10, and a plate surface 11 a of the projecting piece 11 penetrates a thick portion of the main body 10 to inner wall surface of the recess 10 a. The other end 12b of the exhaust passage 12 having one end 12a opened to 10d is opened. At the other end 12 b of the exhaust passage 12, a nozzle 14 that connects the hose 13 of the exhaust device 9 is provided. The exhaust device 9 exhausts the inside of the recess 10a through a suction pump or the like provided outside the clean room.

Next, the operation of the dust diffusion preventing device in the actuator will be described.
The adapter 8 is attached to the flange 6 of the motor 1, and the hose of the exhaust device 9 is connected to the nozzle 13. Then, the exhaust device 9 is driven together with the operation of the motor 1. By driving the exhaust device 9, the inside of the concave portion 10 a of the adapter 8 is sucked through the hose 13. Thus, when the dust in the motor 1 flows into the cavity 15 between the recess 10a of the adapter 8 and the flange 6 of the motor 1 through the lead-out hole 10b of the output shaft 4 as the motor 1 operates, The dust is exhausted together with the air in the cavity 15 by the suction force.

FIG. 3 is a modification of the adapter in which the same parts as those in FIG. 2 are denoted by the same reference numerals. In this case, arc-shaped protrusions 16a, 16a, 16b and 16c are formed so as to be continuous at regular intervals in the circumferential direction. The heights of the protrusions 16a, 16b, and 16c are formed in accordance with the height of the inner wall surface 10d, and the gap 17 between the protrusions 16a, 16b, and 16c is shifted from the opening position A of the other end 12b of the exhaust passage 12. It is formed as follows. The cavity 15 communicates with a passage 18 formed between the inner wall surface 10d and the protrusions 16a, 16b, and 16C through the gap 17.
According to this modified example, the dust flowing out from the lead-out hole 10b of the output shaft 4 enters the inside of the protrusions 16a, 16b, 16c of the cavity 15, passes through the gaps 17, and the inner wall surface 10d and the protrusions 16a, 16b. , 16C. Then, the other end 12 b of the exhaust passage 12 is reached through the passage 18. Therefore, the dust is uniformly dispersed in the hollow portion 15 and is exhausted from the exhaust passage 12 through the passage 18 without being concentrated.

FIG. 4 shows another embodiment of the dust diffusion preventing apparatus of the present invention. The same parts as those in FIG.
In this case, the adapter 8 is not used, but the motor flange 19 itself of the motor 1 has the function of an adapter.
The motor flange 19 has a hollow cavity 20 formed therein, and a passage 21 communicating with the cavity 20 is formed in the wall surface 19 a of the motor flange 19. One end of the passage 21 communicates with the hollow portion 20, and the other end of the passage 21 opens to the wall surface 19 b of the motor flange 19 that communicates with the outside. And the bearing 5 is provided in the wall surface 19c which partitions off the cavity 20 of the motor flange 19 of the motor 1 and the inside of the motor case 2.

    According to this embodiment, since the motor flange 19 has an adapter function, the number of parts can be reduced.

  The present invention is not limited to the above-described embodiment. For example, the exhaust of dust flowing out from the motor case 2 of the motor has been described. However, the present invention may be applied to other actuators such as a hydraulic motor, a generator, or a ball screw. Needless to say, it can be applied. Further, the adapter may be integrally formed with a synthetic resin or may be made of metal. In addition, it goes without saying that the present invention can be appropriately modified and implemented without departing from the scope of the present invention.

It is a fragmentary sectional view which shows the dust diffusion prevention apparatus in the actuator by embodiment of this invention. It is a perspective view which shows the adapter of FIG. It is a perspective view which shows the modification of the adapter of FIG. It is a fragmentary sectional view which shows the dust diffusion prevention apparatus in the actuator by other embodiment of this invention.

Explanation of symbols

1 Motor (actuator)
2 Motor Case 4 Output Shaft 5 Bearing 6 Flange 7 Dust Diffusion Prevention Device 8 Adapter 9 Exhaust Device 10 Main Body 10a Recess 10b Pull-out Hole 10c Hole 11 Projection Piece 12 Exhaust Passage 15, 20 Cavity 16a, 16b, 16c Projection 17 Gap 18 , 21 passage

Claims (2)

  In the device for preventing the diffusion of dust flowing out from the hole of the actuator case that pulls out the output shaft of the actuator to the outside, an adapter that covers the output shaft pull-out hole of the actuator is attached to the actuator case, and the inner cavity portion of the adapter is attached to the adapter. A dust diffusion preventing device for an actuator, wherein an exhaust device for forcibly exhausting the dust flowing out to the adapter together with the internal air of the adapter is connected. The adapter, to form a recess on the inside of the upper Symbol tabular body formed in a shape corresponding to the end surface of the actuator case constitutes, in the center of the bottom surface of the recess of the adapter, the output shaft of the actuator A hole to be drawn out is formed, and the other end of the exhaust passage having one end opened on the inner wall surface of the recess through the thick part of the main body is opened on the side surface of the main body, and the bottom surface of the recess of the adapter is formed. An arc-shaped protrusion is formed along the inner wall surface of the recess so as to be continuous at a predetermined interval in the circumferential direction, and the gap between the protrusions is deviated from the opening position of the other end of the exhaust passage. forming manner, the opening position, the recess and the upper Symbol dust diffusion-proof in the actuator according to claim 1, characterized in that the suction pump has been connected for evacuating the interior cavity between the end surface of the actuator case Apparatus.

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