JP2505001Y2 - Gearbox sealing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a gearbox sealing structure, more specifically, a speed reducer and a speed increaser for driving parts of unmanned vehicles, robots, automatic machines, etc. used in a clean room. In the above, the present invention relates to a gearbox sealing structure capable of preventing air from flowing between the inside and the outside of the gearbox and preventing dust generation by the gearbox.

[Prior Art] Gearboxes such as speed reducers and speed reducers related to drive units such as unmanned vehicles, robots, and automatic machines used in clean rooms have a structure as shown in FIGS. 3 and 4, for example. There is one.

FIG. 3 is a sectional side view of a conventional gear box, and FIG. 4 is an enlarged sectional side view of a second stopper plug included in the gear box of FIG.

In FIG. 3, reference numeral 1 denotes a gear box, a plurality of gear boxes 1 are mounted on a vehicle body 2, and a reduction gear including a plurality of reduction gears, reduction gear shafts and bearings inside each gear box 1. 3, the input shafts of the reduction gears 3 that are respectively outside the gear box 1 are connected to a motor 4a, a brake 4b, and an encoder 4c, and the reduction gears 3 are outside the gear box 1. A tire 5 is connected to the output shaft of the.
The driving force input from the motor 4a drives the upper tire 5 decelerated by the reduction gear 3.

Lubricating oil 6 for lubricating the speed reducer 3 is injected into the gear box 1 to prevent the lubricating oil 6 from leaking to the outside from the gear box 1 and foreign matter from entering the inside. An oil seal 7 is attached to the input shaft and the output shaft of the reduction gear 3 that penetrates the outer wall of the gear box 1.

The first stopper 8 is an air outlet when the lubricating oil 6 is put in from the second stopper 9, and an air inlet when the dirty lubricating oil is taken out. Although not shown, the outlet for the lubricating oil 6 is provided in the lower portion of the gear box 1.

When the speed reducer 3 configured as shown in FIG. 3 is operated by the input from the motor 4a, the oil temperature of the lubricating oil 6 in the gear box 1 rises and the air inside the gear box 1 is warmed. Although the internal pressure rises, as shown in FIG. 4, the air escapes from the vent hole 9a (pore) provided in the second stopper 9, and the internal pressure of the gear box 1 is the same as the external pressure. Kept in.

When the operation is stopped and the inside of the gear box 1 becomes cold, the internal pressure tends to decrease, but in that case, air flows in from the vent hole 9a of the second stopper 9 to make the internal pressure equal to the external pressure. To That is, air flows in and out (breathes) through the vent hole 9a of the second stopper 9.

[Problems to be Solved by the Invention] However, the conventional gear box 1 configured as described above is
When used in food-related facilities, clean rooms, etc., if the air inside the gearbox goes out, vaporized lubricating oil and abrasion powder of gears pollute the environment. It is not preferable that metal abrasion powder or the like is scattered in order to keep the environment clean.

That is, it is strictly prohibited to breathe the atmosphere in the clean room and the air in the gear box, and there is a problem that it is difficult to use the conventional gear box as shown in FIGS. 3 and 4.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a gearbox for a drive unit such as an unmanned vehicle, a robot, or an automatic machine used in a clean room. In the above, a magnetic seal device is attached to a rotating shaft such as an input shaft and an output shaft penetrating the outer wall of the gear box, and a part of the outer wall of the gear box is thermally expanded or contracted by air inside the gear box. A bellows is installed to absorb changes in the internal volume, and a magnetic seal device and a bellows for adjusting air pressure are used together to expand and contract to eliminate the movement of air between the inside and outside of the gear box. An object of the present invention is to provide a sealing structure for a gear box, which is characterized in that it is possible to prevent dust from being generated.

[Embodiment] An embodiment of the gearbox sealing structure according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a sectional side view of a magnetic seal device portion of the gearbox sealing structure, and FIG. 2 is a sectional side view of a bellows portion of the gearbox sealing structure.

In the gear box sealing structure of the present invention, a magnetic seal device 12 is newly provided in the gear box 11 shown in FIG. 1 in place of the oil seal 7 of the conventional gear box 1 shown in FIG. , And the conventional first stopper 8 and the second stopper 9 shown in FIG. 3 are sealed, and a bellows 21 shown in FIG. It is constructed similarly to that of FIG.

As shown in FIG. 1, the magnetic seal device 12 is mounted on the outer periphery of the rotary shaft 13 such as an input shaft and an output shaft made of a magnetic material that penetrates the outer wall of the gear box 11 and projects to the outside. There is a sleeve 14 made of a cylindrical non-magnetic material that is inserted into the inner surface of the through hole of the outer wall of the gear box 11, a spacer 15 that is inserted into the inner peripheral portion of the sleeve 14 adjacent to the bearing, and a sleeve 14. The gear box includes an annular magnet 16 to be inserted into the inner peripheral portion of the gear, and a pair of poles 17 that are arranged on both sides of the magnet 16 and are inserted into the inner peripheral portion of the sleeve 14 and are formed of an annular magnetic body. The magnetic fluid 18 is placed in the gap between the through hole 11 and the rotary shaft 13 such as the input shaft and output shaft.
And the magnetic fluid 18 is adhered to both the rotating shaft 13 and the pole 17, the magnetic sealing device due to the magnetic field generated by the magnet.
The part of the rotary shaft 13 to which 12 is attached is magnetically sealed.

The bellows 21 is made of an elastic body such as rubber and is attached to the outside of a part of the outer wall of the gear box 11 as shown in FIG. The breathing due to the change in volume is absorbed by the change in volume due to the change in stroke of the outer end portion of the bellows 21.

[Advantages of the Invention] In the gearbox sealing structure configured as described above, the conventional oil seal is replaced with a magnetic seal device, and the conventional first and second stoppers are hermetically sealed instead of a bellows. By providing the, it is possible to eliminate the flow of air between the inside and outside of the gear box 11, and to prevent dust generation from the inside of the gear box, and it is possible to use it in a clean room of class 10 to 100. It has become possible and can be used as a drive unit for various clean room compatible devices.

[Brief description of drawings]

FIG. 1 is a sectional side view of a magnetic seal device portion of a gearbox sealing structure according to the present invention, and FIG. 2 is a sectional side view of a bellows portion of a gearbox sealing structure according to the present invention. FIG. 4 is a sectional side view of a conventional gear box, and FIG. 4 is an enlarged sectional side view of a second stopper plug included in the gear box of FIG. 1 …… Gearbox 11 …… Gearbox 12 …… Magnetic seal device 13 …… Rotating shaft such as input shaft and output shaft 14 …… Sleeve 15 …… Spacer 16 …… Magnet 17 …… Pole 18 …… Magnetic fluid 21 ...... Bellows

Claims (1)

(57) [Scope of utility model registration request] 1. In a gearbox such as an unmanned vehicle, a robot, a speed reducer for a drive unit of an automatic machine, a speed increaser, or the like used in a clean room, an input shaft, an output shaft, or the like penetrating an outer wall of the gearbox. A magnetic seal device is attached to the rotating shaft, and a bellows for absorbing a change in internal volume due to thermal expansion and contraction of air inside the gear box is attached to a part of the outer wall of the gear box. The characteristic gearbox sealing structure.