JP2007046653A - Shaft seal part structure of gear reducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft seal part structure of a gear reducer capable of reducing abrasion and deformation of a lip of an oil seal. <P>SOLUTION: This shaft seal part structure of a motor shaft 4 of a geared motor 1 where a motor portion 2 and a reduction gear portion 12 are connected through a load-side bearing bracket 3, a worm 7 and a worm wheel 15 are incorporated in a gear case 14 of the reduction gear portion 12, a lubricant for lubricating the worm 7 and the worm wheel 15 are filled in the gear box 14, and the leakage of lubricant from the motor shaft 4 is sealed by the oil seal 8, is composed of the oil seal 8, a filter 9 for filtering the lubricant, and an extension portion (pressure reducing portion) 3a of the load-side bearing bracket 3 mounted in opposition to an outer peripheral face of the motor shaft 4 through a clearance Δ for reducing a pressure of lubricant, the extension portion 3a is positioned at a side closer to the worm 7 with respect to the oil seal 8, and the filter 9 is positioned between the oil seal 8 and the extension portion 3a, and is provided with a reinforcement plate 10 at its one side face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention incorporates a gear reduction mechanism in a gear box, encloses a lubricant for lubricating the gear reduction mechanism in the gear box, and seals leakage of the lubricant from the rotating shaft constituting the gear reduction mechanism with an oil seal. The present invention relates to a shaft seal structure of a gear reducer.

  Generally, a gear reducer incorporates a gear reduction mechanism in a gear box, encloses a lubricant that lubricates the gear reduction mechanism in the gear box, and oil leakage from the rotating shaft that constitutes the gear reduction mechanism. Sealed with a seal. In order for the oil seal to maintain a sufficient sealing function, the sliding portion between the lip of the oil seal and the rotating shaft needs to be properly lubricated with a lubricant.

  However, in the gear reducer as described above, when the rotating shaft rotates, wear powder is generated due to meshing of the gears, and this wear powder is mixed into the lubricant. When the lubricant mixed with wear powder reaches the sliding part of the oil seal lip and the rotary shaft, the oil seal lip is worn, and the sliding part of the oil seal lip and the rotary shaft is properly lubricated with the lubricant. There is a problem that the sealing function of the oil seal is lowered. Further, when the rotating shaft rotates, the lubricant is agitated by the rotation of the gear and becomes high pressure. This high pressure lubricant directly acts on the lip of the oil seal, causing the lip to deform, and the sliding part between the oil seal lip and the rotating shaft cannot maintain proper contact. However, there is a problem that the oil seal is not properly lubricated and the sealing function of the oil seal is lowered.

Conventionally, the following shaft seal structure of a gear motor has been proposed as a means for preventing a reduction in the sealing function of an oil seal due to lubricating oil mixed with wear powder. That is, a gear motor in which a motor part and a reduction gear part are partitioned by a partition wall, a motor shaft passes through a through hole formed in the partition wall, and a pinion at the tip of the motor shaft meshes with a driven gear in the reduction gear part. The motor shaft oil seal disposed in the through hole has a hole through which the motor shaft is inserted in the center portion, and is capable of lubricating oil flow from the speed reducer portion side. There has been proposed a shaft seal structure of a gear motor provided with a thin plate-like filter that prevents foreign matter such as worn metal powder from entering the motor shaft oil seal side (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-112952

Further, the following gear motor shaft seal structure has been proposed as a means for reducing the deformation of the lip due to the pressure of the lubricating oil acting on the lip of the oil seal and preventing the oil seal from deteriorating. . That is, an electric motor portion having a drive gear portion projecting from an end surface of a bracket that supports a rotary shaft having a drive gear formed at one end portion thereof, a gear that engages with the drive gear to reduce rotation, a gear shaft, and The output shaft that is decelerated and rotated comprises a speed reducer portion supported by a speed reducer case, and the speed reducer portion is a geared motor that is directly connected to the bracket portion of the motor portion. An oil barrier is formed on the speed reducer side of the oil seal that is supported via the bearing and is disposed on the speed reducer side of the bearing. There has been proposed a geared motor in which a slight gap is provided between them (see, for example, Patent Document 2).
JP 2000-278906 A

  By the way, in the shaft seal structure of the gear motor disclosed in the above Japanese Patent Laid-Open No. 10-112952, the wear of the oil seal lip due to the lubricating oil mixed with wear powder can be reduced, but it acts on the oil seal lip of the lubricating oil. There is a problem that the deformation of the lip due to the pressure to be applied cannot be reduced.

  Further, in the geared motor disclosed in the above Japanese Patent Laid-Open No. 2000-278906, the deformation of the lip due to the pressure acting on the lip of the oil seal of the lubricating oil can be reduced, but the lubricating oil mixed with the wear powder is used. There is a problem that the wear of the lip of the oil seal cannot be reduced. Furthermore, in the geared motor disclosed in the above Japanese Patent Laid-Open No. 2000-278906, a slight gap is provided between the inner diameter of the oil barrier and the rotating shaft, so that the lip of the oil seal and the rotating shaft There is a risk that the amount of lubricating oil necessary for proper lubrication may not be supplied to the sliding part. In this case, the sliding part is not properly lubricated with the lubricating oil, and the wear of the oil seal lip proceeds. There is.

  Therefore, an object of the present invention is to provide a shaft seal part structure of a gear reducer that can reduce wear and deformation of a lip of an oil seal.

  According to a first aspect of the present invention, a gear reduction mechanism is incorporated in a gear box, a lubricant that lubricates the gear reduction mechanism is enclosed in the gear box, and the lubrication from the rotating shaft that constitutes the gear reduction mechanism is performed. In the shaft seal structure of the gear reducer that seals the leakage of the agent with an oil seal, the shaft seal structure of the gear reducer is provided on the outer peripheral surface of the oil seal, the filter for filtering the lubricant, and the rotating shaft. A pressure reducing unit that opposes the gap and reduces the pressure of the lubricant, the pressure reducing unit is located closer to the gear reduction mechanism than the oil seal, and the filter includes the oil seal and the It is located between the pressure reduction part.

  According to a second aspect of the present invention, in the shaft seal structure of the gear reducer according to the first aspect, the filter has a reinforcing plate on at least one side surface.

  According to the first aspect of the present invention, the shaft seal structure of the gear reducer includes the oil seal, a filter that filters the lubricant, and an outer peripheral surface of the rotary shaft that is opposed to the lubricant through a gap. A pressure reduction unit that reduces the pressure of the oil seal, the pressure reduction unit is located closer to the gear reduction mechanism than the oil seal, and the filter is located between the oil seal and the pressure reduction unit. Therefore, the pressure of the lubricant reaching the periphery of the rotating shaft is reduced by the pressure reducing unit, and the pressure of the lubricant does not directly act on the oil seal, and the lip of the oil seal Can be prevented from being deformed by the pressure of the lubricant. When the lubricant whose pressure has been reduced passes through the gap between the inner peripheral surface of the pressure reducing portion and the outer peripheral surface of the rotary shaft, reaches the filter, and further passes through the filter. Filter to remove wear debris. Then, the clean lubricant, which has been filtered by the filter to remove wear powder, is supplied to the sliding portion between the lip of the oil seal and the rotating shaft, and the sliding portion is appropriately lubricated. As a result, wear of the lip of the oil seal due to wear powder and deformation of the lip of the oil seal due to the pressure of the lubricant can be reduced. As a result, the life of the oil seal can be extended, and as a result, the life of the gear reducer can be extended.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the filter has a reinforcing plate on at least one side surface, so that the deformation of the filter due to the pressure of the lubricant is prevented. it can. Therefore, the deformation of the filter due to the pressure of the lubricant is prevented, so that the lubricant mixed with wear powder can be prevented from entering the sliding portion between the lip of the oil seal and the rotating shaft. .

  The best mode of the shaft seal portion structure of the gear reducer according to the present invention is a mode applied to the shaft seal portion structure of the motor shaft 4 of the geared motor, and the motor portion 2 and the speed reducer portion 12 are the load side bearing bracket 3. The worm 7 and the worm wheel 15 are built in the gear box 14 of the speed reducer unit 12, and lubricating oil for lubricating the worm 7 and the worm wheel 15 is sealed in the gear box 14. In the shaft seal structure of the motor shaft 4 of the geared motor 1 that seals the leakage of the lubricating oil by the oil seal 8, the shaft seal structure of the motor shaft 4 of the geared motor 1 filters the oil seal 8 and the lubricating oil. The filter 9 includes an extension portion (pressure reduction portion) 3a of the load side bearing bracket 3 that opposes the outer peripheral surface of the motor shaft 4 via a gap Δ and reduces the pressure of the lubricating oil. Located near side than Lucille 8 to the worm 7, the filter 9 is located between the extended portion 3a oil seal 8, the filter 9 is one having a reinforcing plate 10 on one side. Each embodiment will be described below.

  A geared motor according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view including a partial cross section of a geared motor according to Embodiment 1 of the present invention. 2 is a cross-sectional view of the main part in the frame A shown in FIG. 3 is a side view including a partial cross section of the geared motor shown in FIG. 4 is a cross-sectional view of the main part in the frame B shown in FIG. FIG. 5 is a cross-sectional view of the main part in the frame C shown in FIG.

  As shown in FIG. 1, the geared motor 1 according to the first embodiment of the present invention includes a motor unit 2 and a speed reducer unit 12, and the motor unit 2 and the speed reducer unit 12 are described later of the motor unit 2. It is connected via a load side bearing bracket 3.

  As shown in FIG. 1, the motor unit 2 includes a motor shaft 4 that is rotatably supported at both ends, and a frame 5. A load-side bearing bracket 3 that supports the load side of the motor shaft 4 via a load-side bearing 6 is attached to one end of the frame 5. Although not shown, the other end of the frame 5 is on the side opposite to the load side of the motor shaft 4. An anti-load-side bearing bracket (not shown) that supports the non-load-side bearing via an anti-load-side bearing (not shown) is attached. Further, the load side of the motor shaft 4 extends through the load-side bearing 6, and a worm 7 is formed on the outer periphery of the extension. The worm 7 is located in a later-described gear case 13 of the speed reducer 12 and meshes with a later-described worm wheel 15 incorporated in the gear case 13 of the speed reducer 12. Therefore, the motor shaft 4 has a function as an input shaft of the reduction gear unit 12.

  As shown in FIGS. 1 and 3, the speed reducer portion 12 includes a gear case 13 and a bearing bracket 13 ′ that are attached to the load side bearing bracket 3 of the motor portion 2, and the load side bearing bracket 3, the gear case 13, and the bearing bracket 13. A gear box 14 is constituted by 'and. As shown in FIG. 3, the bearing bracket 13 ′ is detachably attached to the gear case 13 with bolts. A worm wheel 15 that meshes with the worm 7 and an output shaft 16 connected to the worm wheel 15 are incorporated in the gear box 14. Both ends of the output shaft 16 are rotatably attached by bearings 17 and 17 ′ incorporated in the gear case 13 and the bearing bracket 13 ′, respectively. The worm 7 and the worm wheel 15 constitute a gear reduction mechanism. The gear box 14 is filled with lubricating oil for lubricating a gear reduction mechanism constituted by the worm 7 and the worm wheel 15.

  As shown in FIGS. 1 and 2, the load-side bearing bracket 3 has the load side of the motor shaft 4 penetrated through the load-side bearing 6, and an opening on one end side of the frame 5 of the motor unit 2 and a reduction gear unit. The opening part of 12 gear cases 13 is closed and the motor part 2 and the reduction gear part 12 are partitioned off.

  Next, the shaft seal structure of the motor shaft 4 will be described below.

  As shown in detail in FIG. 2, an oil seal 8 is installed between the load-side bearing bracket 3 and the outer peripheral surface of the motor shaft 4 to seal the leakage of lubricating oil in the gear box 14. The oil seal 8 is disposed on the worm 7 side of the load side bearing 6, and when the oil in the gear box 14 is agitated and scattered by the rotation of the worm 7 and the worm wheel 15, The lubricating oil is prevented from leaking to the motor unit 2. 2, the oil seal 8 includes a lip 8a, a dust guard 8b, and a garter spring 8c. The lip 8a is pressed against the outer peripheral surface of the motor shaft 4 by the tightening force of the garter spring 8c. The sliding part between the lip 8a and the outer peripheral surface of the motor shaft 4 maintains an appropriate contact.

  As shown in detail in FIG. 2, a thin plate-like filter 9 is mounted adjacent to the oil seal 8 between the load-side bearing bracket 3 and the outer peripheral surface of the motor shaft 4. The filter 9 is disposed on the worm 7 side with respect to the oil seal 8, and this filter 9 filters the abrasion powder mixed in the lubricant oil that has been stirred and scattered. The filter 9 is formed with a central hole having an inner diameter that is rotatably in close contact with the outer peripheral surface of the motor shaft 4 on which the lip 8a of the oil seal 8 slides, and the outer peripheral surface is concentric with the central hole. It has a formed ring shape. And as a material of filter 9, nonwoven fabrics, such as polyester and polyamide, are suitable, and if these materials are used, it can manufacture at low cost by stamping etc. from a thin plate-shaped material. The material of the filter 9 may be a material that can filter fine particles such as wear powder and pass through the lubricating oil, and has a shape retaining property that does not deform even when subjected to the pressure of the lubricating oil. That's fine.

  In this embodiment, the filter 9 has a reinforcing plate 10 on one side surface thereof, that is, the side surface on the oil seal 8 side. The reinforcing plate 10 has a substantially same outer diameter as that of the filter 9, a central hole having a larger inner diameter than the central hole of the filter 9 through which the motor shaft 4 passes is formed at the center, and is a thin and rigid metal plate. It is made with.

  In a state where the filter 9 having the reinforcing plate 10 on one side surface is incorporated adjacent to the oil seal 8, an annular shape between the inner peripheral surface of the central hole of the reinforcing plate 10 and the outer peripheral surface of the motor shaft 4 is provided. The filter 9 shields the gap, and the lubricating oil in the gear box 14 can flow between the oil seal 8 and the filter 9 through the portion of the filter 9 exposed in the annular gap portion. It has become.

  In this embodiment, the filter 9 has the reinforcing plate 10 on one side surface, so that deformation of the filter 9 due to the pressure of the lubricating oil can be suppressed and the filter 9 can be thinned as will be described later.

  In this embodiment, the filter 9 exposed in the annular gap portion between the inner peripheral surface of the central hole of the reinforcing plate 10 and the outer peripheral surface of the motor shaft 4 from the reduction gear portion 12 side to the oil seal 8 side. However, by forming through holes and slits in the reinforcing plate 10 within a range that does not impair its rigidity, the effective filtration area of the lubricating oil is increased, and the filter 9 It is possible to prevent clogging.

  As shown in detail in FIG. 2, a portion on the worm 7 side of the load side bearing bracket 3 is extended radially inward, and a gap is formed between the inner peripheral surface of the extended portion 3 a and the outer peripheral surface of the motor shaft 4. Δ is formed. The extension portion 3a of the load side bearing bracket 3 is located adjacent to the filter 9 and closer to the worm 7 than the filter 9, and constitutes a pressure reducing portion that reduces the pressure of the lubricating oil that is stirred and scattered.

  As described above, the shaft seal portion structure of the motor shaft 4 includes the oil seal 8, the filter 9, and the extension portion 3 a (pressure reduction portion) of the load side bearing bracket 3.

  Next, the shaft seal structure of the output shaft 16 will be described below.

  First, the shaft seal portion structure on one end side of the output shaft 16 (the portion of the frame B in FIG. 3) will be described below. As shown in detail in FIG. 4, an oil seal 18 is mounted between the gear case 13 and the outer peripheral surface of the output shaft 16 to seal the leakage of lubricating oil in the gear box 14. The oil seal 18 is disposed outside the bearing 17. When the oil in the gear box 14 is agitated and scattered by the rotation of the worm 7 and the worm wheel 15, the oil seal 18 is moved to the bearing. 17 to prevent leakage to the outside. As shown in detail in FIG. 4, the oil seal 18 includes a lip 18a, a dust guard 18b, and a garter spring 18c. The lip 18a is pressed against the outer peripheral surface of the output shaft 16 by the tightening force of the garter spring 18c. A sliding portion between the lip 18a and the outer peripheral surface of the output shaft 16 maintains appropriate contact.

  As shown in detail in FIG. 4, a thin plate-like filter 19 is mounted adjacent to the oil seal 18 between the gear case 13 and the outer peripheral surface of the output shaft 16. The filter 19 is disposed on the side of the bearing 17 from the oil seal 18, and this filter 19 filters the abrasion powder mixed in the lubricating oil that has been stirred and scattered. The filter 19 is formed with a central hole having an inner diameter that is rotatably in close contact with the outer peripheral surface of the output shaft 16 on which the lip 18a of the oil seal 18 slides, and the outer peripheral surface is concentric with the central hole. It has a formed ring shape. Since the material of the filter 19 is the same as that of the filter 9 described above, the description thereof is omitted.

  In this embodiment, the filter 19 has a reinforcing plate 20 on one side surface thereof, that is, the side surface on the oil seal 18 side. This reinforcing plate 20 has a substantially identical outer diameter as that of the filter 19, a central hole having a larger inner diameter than the central hole of the filter 19 through which the output shaft 16 passes is formed at the center, and is a thin and rigid metal plate It is made with.

  In a state where the filter 19 having the reinforcing plate 20 on one side is incorporated adjacent to the oil seal 18, an annular shape between the inner peripheral surface of the central hole of the reinforcing plate 20 and the outer peripheral surface of the output shaft 16 is provided. The filter 19 shields the gap so that the lubricating oil in the gear box 14 can flow between the oil seal 18 and the filter 19 through the portion of the filter 19 exposed in the annular gap portion. It has become.

  In this embodiment, the filter 19 has the reinforcing plate 20 on one side surface, so that the deformation of the filter 19 due to the pressure of the lubricating oil can be suppressed and the filter 19 can be thinned as will be described later.

  In this embodiment, from the worm wheel 15 side to the oil seal 18 side, the filter 19 exposed in the annular gap portion between the inner peripheral surface of the central hole of the reinforcing plate 20 and the outer peripheral surface of the output shaft 16 is removed. Although only the portion has a circulation and filtration function of the lubricating oil, the effective filtration area of the lubricating oil is increased by forming through holes and slits in the reinforcing plate 20 within a range that does not impair its rigidity. It is possible to prevent clogging.

  As shown in detail in FIG. 4, a portion of the gear case 13 extends radially inward between the filter 19 and the bearing 17, and the inner peripheral surface of the extended portion 13 a and the outer peripheral surface of the output shaft 16 A gap Δ is formed between them. Further, there is a gap δ between the extended portion 13 a and the bearing 17. The extension portion 13a of the gear case 13 is located adjacent to the filter 19 and closer to the bearing 17 than the filter 19, and constitutes a pressure reducing unit that reduces the pressure of the lubricating oil that is stirred and scattered.

  Next, the shaft seal structure on the other end side of the output shaft 16 (the portion of the frame C in FIG. 3) will be described below. As shown in detail in FIG. 5, an oil seal 18 ′ for sealing the leakage of the lubricating oil in the gear box 14 is mounted between the bearing bracket 13 ′ and the outer peripheral surface of the output shaft 16. The oil seal 18 ′ is disposed outside the bearing 17 ′. The oil seal 18 ′ is lubricated when the lubricating oil in the gear box 14 is stirred and scattered by the rotation of the worm 7 and the worm wheel 15. This prevents oil from leaking outside through the bearing 17 '. Further, as shown in detail in FIG. 5, the oil seal 18 'includes a lip 18'a, a dust guard 18'b, and a garter spring 18'c, and the lip 18' is tightened by the tightening force of the garter spring 18'c. a is pressed against the outer peripheral surface of the output shaft 16, and the sliding portion between the lip 18'a and the outer peripheral surface of the output shaft 16 maintains appropriate contact.

  As shown in detail in FIG. 5, a thin plate-like filter 19 ′ is mounted between the bearing bracket 13 ′ and the outer peripheral surface of the output shaft 16 so as to be adjacent to the oil seal 18 ′. The filter 19 ′ is disposed on the bearing 17 ′ side from the oil seal 18 ′, and this filter 19 ′ filters the abrasion powder mixed in the lubricating oil that has been stirred and scattered. The filter 19 'has a central hole having an inner diameter that is rotatably contacted with the outer peripheral surface of the output shaft 16 on which the lip 18'a of the oil seal 18' slides, and the outer peripheral surface has a central hole. The ring is concentrically formed. Since the material of the filter 19 'is the same as that of the filter 9 described above, the description thereof is omitted.

  Further, in this embodiment, the filter 19 'has a reinforcing plate 20' on one side surface thereof, that is, the side surface on the oil seal 18 'side. The reinforcing plate 20 ′ has an outer diameter substantially the same as that of the filter 19 ′, and a central hole having a larger inner diameter than the central hole of the filter 19 ′ through which the output shaft 16 passes is formed at the center, and is thin and rigid. It is made of a certain metal plate.

  In the state where the filter 19 ′ having the reinforcing plate 20 ′ on one side surface is incorporated adjacent to the oil seal 18 ′, the inner peripheral surface of the central hole of the reinforcing plate 20 ′ and the outer peripheral surface of the output shaft 16 The filter 19 'shields the annular gap between them, and the lubricating oil in the gear box 14 passes through the portion of the filter 19' exposed in the annular gap portion to pass through the oil seal 18 'and the filter 19. 'It is possible to flow in between.

  In this embodiment, the filter 19 ′ has the reinforcing plate 20 ′ on one side surface, so that deformation of the filter 19 ′ due to the pressure of the lubricating oil can be suppressed as described later, and the filter 19 ′ can be made thin. it can.

  In this embodiment, the filter exposed from the worm wheel 15 side to the oil seal 18 'side is exposed in an annular gap between the inner peripheral surface of the central hole of the reinforcing plate 20' and the outer peripheral surface of the output shaft 16. Although only the portion 19 'has a lubricating oil distribution and filtration function, the effective filtration area of the lubricating oil is increased by forming through holes and slits in the reinforcing plate 20' within a range that does not impair its rigidity. The clogging of the filter 19 ′ can be made difficult to occur.

  Further, as shown in detail in FIG. 5, a portion of the bearing bracket 13 ′ extends radially inward between the filter 19 ′ and the bearing 17 ′, and the inner peripheral surface of the extension portion 13′a and the output shaft are extended. A gap Δ is formed between the 16 outer peripheral surfaces. Further, there is a gap δ between the extended portion 13'a and the bearing 17 '. The extension portion 13 ′ a of the bearing bracket 13 ′ is located adjacent to the filter 19 ′ on the side of the bearing 17 ′ from the filter 19 ′, and includes a pressure reduction unit that reduces the pressure of the lubricating oil that is stirred and scattered. It is composed.

  As described above, the shaft seal structure of the output shaft 16 includes the oil seals 18, 18 ', the filters 19, 19', the extension part 13a (pressure reduction part) of the gear case 13, and the extension part 13'a of the bearing bracket 13 '. It consists of and.

  Next, the operation of the shaft seal structure of the geared motor 1 according to the first embodiment having the above configuration will be described.

  When the motor unit 2 is driven, the motor shaft 4 rotates, and the worm 7 formed at the tip of the motor shaft 4 on the load side and the worm wheel 15 meshing with the worm 7 are rotated. The connected output shaft 16 is decelerated and rotates. During the rotation of the motor shaft 4, the lubricating oil in the bearing housing 14 is agitated by the rotation of the worm 7 and the worm wheel 15. The meshing part of the worm 7 and the worm wheel 15 is lubricated by the lubricating oil scattered by the stirring. At this time, wear powder is generated by the meshing of the worm 7 and the worm wheel 15, and this wear powder is mixed in the lubricating oil.

  The lubricating oil that is agitated and scattered by the rotation of the worm 7 and the worm wheel 15 reaches the periphery of the motor shaft 4. The pressure of the lubricating oil reaching the periphery of the motor shaft 4 is reduced by the extension portion 3a (pressure reducing portion) of the load side bearing bracket 3, and the pressure of the lubricating oil does not directly act on the oil seal 8, and the oil The lip 8a of the seal 8 is prevented from being deformed by the pressure of the lubricating oil. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the extension portion 3 a and the outer peripheral surface of the motor shaft 4, reaches the filter 9, and is filtered and worn when passing through the filter 9. The powder is removed. Then, clean lubricating oil that has been filtered by the filter 9 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 8a of the oil seal 8 and the motor shaft 4, and this sliding portion is appropriately lubricated. As a result, wear of the lip 8a of the oil seal 8 due to wear powder and deformation of the lip 8a of the oil seal 8 due to the pressure of the lubricating oil can be reduced.

  Moreover, since the thin plate-like filter 9 has the reinforcing plate 10 on one side surface, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, the deformation of the filter 9 due to the pressure of the lubricating oil is prevented, so that the lubricating oil mixed with the wear powder can be prevented from entering the sliding portion between the lip 8a of the oil seal 8 and the motor shaft 4.

  Further, the lubricating oil that is stirred and scattered by the rotation of the worm 7 and the worm wheel 15 also reaches the periphery of the output shaft 16. The lubricating oil that reaches the periphery of the output shaft 16 passes through the bearing 17 and the bearing 17 ′, the gap δ between the extension portion 13 a of the gear case 13 and the bearing 17, and the extension portion 13 ′ a of the bearing bracket 13 ′ and the bearing 17. It flows into the gap δ between. The pressure of the lubricating oil flowing into the gap δ is reduced by the extension portion 13a (pressure reduction portion) of the gear case 13 and the extension portion 13′a (pressure reduction portion) of the bearing bracket 13 ′, and the pressure of the lubricating oil is reduced by the oil seal. 18 and 18 'do not act directly, and the lips 18a and 18'a of the oil seals 18 and 18' are prevented from being deformed by the pressure of the lubricating oil. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the extension portions 13a and 13′a and the outer peripheral surface of the output shaft 16, and reaches the filters 19, 19 ′. As it permeates, it is filtered to remove wear debris. Then, clean lubricating oil that has been filtered by the filters 19 and 19 ′ and from which the wear powder has been removed is supplied to the sliding portions between the lips 18a and 18′a of the oil seals 18 and 18 ′ and the output shaft 16, and this The sliding part is properly lubricated. Thereby, wear of the lips 18a and 18'a of the oil seals 18 and 18 'due to wear powder and deformation of the lips 18a and 18'a of the oil seals 18 and 18' due to the pressure of the lubricating oil can be reduced. .

  Further, since the thin plate-like filters 19 and 19 ′ have the reinforcing plates 20 and 20 ′ on one side, they can be prevented from being deformed by the pressure of the lubricating oil. Therefore, the deformation of the filters 19 and 19 ′ due to the pressure of the lubricating oil is prevented, so that the lubricating oil mixed with the wear powder slides between the lips 18a and 18′a of the oil seals 18 and 18 ′ and the output shaft 16. Can be prevented from entering the part.

  The shaft seal structure of the geared motor 1 according to the first embodiment having the above-described configuration has the following effects.

  The pressure of the lubricating oil reaching the periphery of the motor shaft 4 is reduced by the extension portion 3a (pressure reducing portion) of the load side bearing bracket 3, and the pressure of the lubricating oil does not act directly on the oil seal 8, and the oil seal 8 lip 8a is prevented from being deformed by the pressure of the lubricating oil. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the extension portion 3 a and the outer peripheral surface of the motor shaft 4, reaches the filter 9, and is filtered and worn when passing through the filter 9. The powder is removed. Then, clean lubricating oil that has been filtered by the filter 9 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 8a of the oil seal 8 and the motor shaft 4, and this sliding portion is appropriately lubricated. As a result, wear of the lip 8a of the oil seal 8 due to wear powder and deformation of the lip 8a of the oil seal 8 due to the pressure of the lubricating oil can be reduced. Moreover, since the thin plate-like filter 9 has the reinforcing plate 10 on one side surface, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, the deformation of the filter 9 due to the pressure of the lubricating oil is prevented, so that the lubricating oil mixed with the wear powder can be prevented from entering the sliding portion between the lip 8a of the oil seal 8 and the motor shaft 4. As a result, the life of the oil seal 8 can be extended, and consequently the life of the geared motor 1 can be extended.

  Further, the lubricating oil reaching the periphery of the output shaft 16 passes through the bearing 17 and the bearing 17 ′, and the gap δ between the extension portion 13a of the gear case 13 and the bearing 17 and the extension portion 13′a of the bearing bracket 13 ′ and the bearing. It flows into the gap δ between 17 ′. The pressure of the lubricating oil flowing into the gap δ is reduced by the extension portion 13a (pressure reduction portion) of the gear case 13 and the extension portion 13′a (pressure reduction portion) of the bearing bracket 13 ′, and the pressure of the lubricating oil is reduced by the oil seal. 18 and 18 'do not act directly, and the lips 18a and 18'a of the oil seals 18 and 18' are prevented from being deformed by the pressure of the lubricating oil. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the extension portions 13a and 13′a and the outer peripheral surface of the output shaft 16, and reaches the filters 19, 19 ′. As it permeates, it is filtered to remove wear debris. Then, clean lubricating oil that has been filtered by the filters 19 and 19 ′ and from which the wear powder has been removed is supplied to the sliding portions between the lips 18a and 18′a of the oil seals 18 and 18 ′ and the output shaft 16, and this The sliding part is properly lubricated. Thereby, wear of the lips 18a and 18'a of the oil seals 18 and 18 'due to wear powder and deformation of the lips 18a and 18'a of the oil seals 18 and 18' due to the pressure of the lubricating oil can be reduced. . Further, since the thin plate-like filters 19 and 19 ′ have the reinforcing plates 20 and 20 ′ on one side, they can be prevented from being deformed by the pressure of the lubricating oil. Therefore, the deformation of the filters 19 and 19 ′ due to the pressure of the lubricating oil is prevented, so that the lubricating oil mixed with the wear powder slides between the lips 18a and 18′a of the oil seals 18 and 18 ′ and the output shaft 16. Can be prevented from entering the part. As a result, the life of the oil seals 18, 18 ′ can be extended, and as a result, the life of the geared motor 1 can be extended.

  Next, a geared motor according to Embodiment 2 of the present invention will be described below with reference to FIGS. FIG. 6 is a front view including a partial cross section of the geared motor according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of the main part in the frame D shown in FIG. FIG. 8 is a side view including a partial cross section of the geared motor shown in FIG. FIG. 9 is a cross-sectional view of the main part in the frame E shown in FIG.

  As shown in FIG. 6, the geared motor 31 according to the second embodiment of the present invention includes a motor unit 32 and a reduction gear unit 42, and the motor unit 32 and the reduction gear unit 42 are described later of the motor unit 32. It is connected via a load side bearing bracket 33.

  As shown in FIG. 6, the motor unit 32 includes a motor shaft 34 that is rotatably supported at both ends, and a frame 35. A load-side bearing bracket 33 that supports the load side of the motor shaft 34 via a load-side bearing 36 is attached to one end of the frame 35, and although not shown, the other end is the non-load side of the motor shaft 34. An anti-load-side bearing bracket (not shown) that supports the non-load-side bearing via an anti-load-side bearing (not shown) is attached. The load side of the motor shaft 34 passes through the load side bearing 36. A key groove for connecting a worm shaft 47 to be described later is formed at the tip of the motor shaft 34.

  As shown in FIGS. 6 and 8, the speed reducer portion 42 includes a gear case 43 and a pair of bearing brackets 44, 44 attached to the load side bearing bracket 33 of the motor portion 32, and the gear case 43 and the pair of bearing brackets 44, 44 are provided. 44 constitutes a gear box 45. A worm shaft 47 having a worm 46 formed on the outer periphery, a worm wheel 48 meshing with the worm 46, and an output shaft 49 connected to the worm wheel 48 are incorporated in the gear box 45.

  Both end portions of the worm shaft 47 are rotatably attached by bearings 50, 50 incorporated in the gear case 43. One end of the worm shaft 47 (on the motor part 32 side) passes through one bearing 50, an attachment hole is formed on this one end part (on the motor part 32 side), and a keyway is formed in this attachment hole. Yes. The tip of the motor shaft 34 is fitted into the mounting hole, and a key is attached to the key groove formed in the mounting hole and the key groove formed in the motor shaft 34. By this key connection, the motor shaft 34 and the worm shaft 47 are integrally connected in the rotation direction.

  Both ends of the output shaft 49 are rotatably mounted by bearings 51 and 51 incorporated in the bearing bracket 44, respectively. The worm 46 and the worm wheel 48 constitute a gear reduction mechanism. The gear box 45 is filled with lubricating oil for lubricating a gear reduction mechanism constituted by a worm 46 and a worm wheel 48.

  As shown in FIG. 6, the load side bearing bracket 33 has the load side of the motor shaft 34 penetrated through the load side bearing 46, and the opening on one end side of the frame 35 of the motor part 32 and the reduction part 42. The opening of the gear case 43 is closed. The load-side bearing bracket 33 is attached to the gear case 43 of the speed reducer portion 42, thereby connecting the motor portion 32 and the speed reducer portion 42.

  Next, the shaft seal structure of the worm shaft 47 will be described below.

  As shown in detail in FIG. 7, an oil seal 52 is mounted between the load-side bearing bracket 33 and the outer peripheral surface of the worm shaft 47 to seal the leakage of the lubricating oil in the gear box 45. The oil seal 52 is disposed closer to the load side bearing 36 than the bearing 50 that rotatably supports the worm shaft 47. The oil seal 52 lubricates the gear box 45 by the rotation of the worm 46 and the worm wheel 49. This prevents the lubricating oil from leaking to the motor unit 32 when the oil is stirred and scattered. Further, as shown in detail in FIG. 7, the oil seal 52 includes a lip 52a, a dust guard 52b, and a garter spring 52c. The lip 52a is pressed against the outer peripheral surface of the worm shaft 47 by the tightening force of the garter spring 52c. The sliding part between the lip 52a and the outer peripheral surface of the worm shaft 47 maintains an appropriate contact.

  Further, as shown in detail in FIG. 7, a thin plate-like filter 53 is mounted adjacent to the oil seal 52 between the load-side bearing bracket 33 and the outer peripheral surface of the worm shaft 47. The filter 53 is disposed on the worm 46 side with respect to the oil seal 52, and this filter 53 filters the abrasion powder mixed in the lubricating oil which has been stirred and scattered. The filter 53 is formed with a central hole having an inner diameter that is rotatably in close contact with the outer peripheral surface of the worm shaft 47 on which the lip 52a of the oil seal 52 slides, and the outer peripheral surface is concentric with the central hole. It has a formed ring shape. Since the material of the filter 53 is the same as that of the filter 9 described above, the description thereof is omitted.

  In this embodiment, the filter 53 has reinforcing plates 54 on both side surfaces thereof. The reinforcing plate 54 has an outer diameter substantially the same as that of the filter 53, and a central hole having a larger inner diameter than the central hole of the filter 53 through which the worm shaft 47 passes is formed at the center, and is a thin and rigid metal plate. It is made with.

  In the state where the filter 53 having the reinforcing plates 54 on both side surfaces is incorporated adjacent to the oil seal 52, an annular gap between the inner peripheral surface of the central hole of the reinforcing plate 54 and the outer peripheral surface of the worm shaft 47. The filter 53 shields the lubricating oil in the gear box 45 so that it can flow between the oil seal 52 and the filter 53 through the portion of the filter 53 exposed in the annular gap portion. It has become.

  In this embodiment, the filter 53 has the reinforcing plates 54 on both side surfaces, so that deformation of the filter 53 due to the pressure of the lubricating oil can be suppressed and the filter 53 can be thinned as will be described later.

  In this embodiment, the filter 53 exposed from the reduction gear portion 42 side to the oil seal 52 side is exposed in an annular gap portion between the inner peripheral surface of the central hole of the reinforcing plate 54 and the outer peripheral surface of the worm shaft 47. However, by forming the through holes and slits in the reinforcing plate 54 within the range that does not impair the rigidity, the effective filtration area of the lubricating oil is increased, and the filter 53 is provided. It is possible to prevent clogging.

  Further, as shown in detail in FIG. 7, a ring 55 is attached to the inner peripheral surface of the load side bearing bracket 33 by press fitting or the like at a position closer to the bearing 50, that is, the worm 46 than the filter 53. A gap Δ is formed between the inner peripheral surface of the ring 55 and the outer peripheral surface of the worm shaft 47. Further, the side surface on the filter 53 side of the ring 55 is adjacent to the reinforcing plate 54, and the side surface on the bearing 50 side has a gap δ with the bearing 50. In other words, the ring 55 is positioned adjacent to the filter 53 and closer to the worm 46 than the filter 53, and constitutes a pressure reducing unit that reduces the pressure of the lubricant oil that is stirred and scattered.

  As described above, the shaft seal portion structure of the worm shaft 47 includes the oil seal 52, the filter 53, and the ring 55 (pressure reducing portion).

  Next, the shaft seal structure of the output shaft 49 will be described below.

  As shown in detail in FIG. 9, an oil seal 56 for sealing leakage of lubricating oil in the gear box 45 is mounted between the bearing bracket 44 and the outer peripheral surface of the output shaft 49. The oil seal 56 is disposed outside the one bearing 51. The oil seal 56 is used when the lubricating oil in the gear box 45 is stirred and scattered by the rotation of the worm 46 and the worm wheel 48. Is prevented from leaking outside through the bearing 51. As shown in detail in FIG. 9, the oil seal 56 includes a lip 56a, a dust guard 56b, and a garter spring 56c. The lip 56a is pressed against the outer peripheral surface of the output shaft 49 by the tightening force of the garter spring 56c. The sliding part between the lip 56a and the outer peripheral surface of the output shaft 49 maintains an appropriate contact.

  Further, as shown in detail in FIG. 9, a thin plate-like filter 57 is mounted between the bearing bracket 44 and the outer peripheral surface of the output shaft 49 so as to be adjacent to the oil seal 56. The filter 57 is disposed on the one bearing 51 side from the oil seal 56, and this filter 57 filters the abrasion powder mixed in the lubricating oil which has been stirred and scattered. The filter 57 is formed with a central hole having an inner diameter that is rotatably in close contact with the outer peripheral surface of the output shaft 49 on which the lip 56a of the oil seal 56 slides, and the outer peripheral surface is concentric with the central hole. It has a formed ring shape. Since the material of the filter 57 is the same as that of the filter 9 described above, the description thereof is omitted.

  In this embodiment, the filter 57 has a reinforcing plate 58 on one side surface thereof, that is, the side surface on the oil seal 56 side. The reinforcing plate 58 has a substantially same outer diameter as that of the filter 57, a central hole having a larger inner diameter than the central hole of the filter 57 through which the output shaft 49 penetrates at the center, and is a thin and rigid metal plate. It is made with.

  In a state where the filter 57 having the reinforcing plate 58 on one side surface is incorporated adjacent to the oil seal 56, an annular shape between the inner peripheral surface of the central hole of the reinforcing plate 58 and the outer peripheral surface of the output shaft 49 is provided. The filter 57 shields the gap, so that the lubricating oil in the gear box 45 can flow between the oil seal 56 and the filter 57 through the portion of the filter 57 exposed in the annular gap portion. It has become.

  In this embodiment, the filter 57 has the reinforcing plate 58 on one side surface, so that deformation of the filter 57 due to the pressure of the lubricating oil can be suppressed and the filter 57 can be thinned as will be described later.

  In this embodiment, the filter 57 exposed from the worm wheel 48 side to the oil seal 56 side is exposed in an annular gap portion between the inner peripheral surface of the central hole of the reinforcing plate 58 and the outer peripheral surface of the output shaft 49. Although it has a lubricating oil distribution and filtration function only in the portion, the effective filtration area of the lubricating oil is increased by forming through holes and slits in the reinforcing plate 58 within a range not to impair its rigidity. It is possible to prevent clogging.

  Further, as shown in detail in FIG. 9, a portion of one bearing bracket 44 extends radially inward between the filter 57 and the bearing 51, and the inner peripheral surface of the extended portion 44 a and the outer periphery of the output shaft 49. A gap Δ is formed with the surface. Further, there is a gap δ between the extended portion 44 a and the bearing 51. The extended portion 44a of the bearing bracket 44 is positioned adjacent to the filter 57 and closer to the bearing 51 than the filter 57, and constitutes a pressure reducing unit that reduces the pressure of the lubricant oil that is stirred and scattered.

  As described above, the shaft seal portion structure of the output shaft 49 includes the oil seal 56, the filter 57, and the extended portion 44 a (pressure reduction portion) of one bearing bracket 44.

  Next, the operation of the shaft seal structure of the geared motor 31 according to the second embodiment having the above-described configuration will be described.

  When the motor unit 32 is driven, the worm shaft 47 connected to the motor shaft 34 is rotated, and the worm 46 formed on the worm shaft 47 and the worm wheel 48 meshing with the worm 46 are rotated. The output shaft 49 connected to is decelerated and rotates. During the rotation of the motor shaft 34, the lubricating oil in the bearing housing 45 is agitated by the rotation of the worm 46 and the worm wheel 48. The meshing part of the worm 46 and the worm wheel 48 is lubricated by the lubricating oil scattered by the stirring. At this time, wear powder is generated by meshing of the worm 46 and the worm wheel 48, and this wear powder is mixed in the lubricating oil.

  Lubricating oil that is stirred and scattered by the rotation of the worm 46 and the worm wheel 48 reaches the periphery of the worm shaft 47. The lubricating oil that reaches the periphery of the worm shaft 47 flows into the gap δ between the ring 55 and the bearing 50 through the bearing 50. The pressure of the lubricating oil flowing into the gap δ is reduced by the ring 55 (pressure reducing portion), and the pressure of the lubricating oil does not directly act on the oil seal 52, and the lip 52a of the oil seal 52 is caused by the pressure of the lubricating oil. Prevents deformation. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the ring 55 and the outer peripheral surface of the worm shaft 47, reaches the filter 53, and is further filtered to wear powder when passing through the filter 53. Is removed. Then, clean lubricating oil that has been filtered by the filter 53 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 52a of the oil seal 52 and the worm shaft 47, and the sliding portion is appropriately lubricated. This can reduce wear of the lip 52a of the oil seal 52 due to wear powder and deformation of the lip 52a of the oil seal 52 due to the pressure of the lubricating oil.

  Moreover, since the thin plate-like filter 53 has the reinforcing plates 54 on both side surfaces, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, by preventing the deformation of the filter 53 due to the pressure of the lubricating oil, it is possible to prevent the lubricating oil mixed with wear powder from entering the sliding portion between the lip 52a of the oil seal 52 and the worm shaft 47.

  Further, the lubricating oil that is agitated and scattered by the rotation of the worm 46 and the worm wheel 48 also reaches the periphery of the output shaft 49. The lubricating oil that reaches the periphery of the output shaft 49 flows into the gap δ between the extension portion 44 a of one bearing bracket 44 and the bearing 51 through the bearing 51. The pressure of the lubricating oil flowing into the gap δ is reduced by the extension 44 a (pressure reducing portion) of one bearing bracket 44, and the pressure of the lubricating oil does not directly act on the oil seal 56, and the lip of the oil seal 56 56a is prevented from being deformed by the pressure of the lubricating oil. The reduced-pressure lubricating oil passes through the gap Δ between the inner peripheral surface of the extension portion 44 a and the outer peripheral surface of the output shaft 49, reaches the filter 57, and is filtered and worn when passing through the filter 57. The powder is removed. Then, clean lubricating oil that has been filtered by the filter 57 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 56a of the oil seal 56 and the output shaft 49, and the sliding portion is appropriately lubricated. As a result, wear of the lip 56a of the oil seal 56 due to wear powder and deformation of the lip 56a of the oil seal 56 due to lubricating oil pressure can be reduced.

  Moreover, since the thin plate-like filter 57 has the reinforcing plate 58 on one side surface, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, by preventing the deformation of the filter 57 due to the pressure of the lubricating oil, it is possible to prevent the lubricating oil mixed with wear powder from entering the sliding portion between the lip 56a of the oil seal 56 and the output shaft 49.

  According to the shaft seal portion structure of the geared motor 31 according to the second embodiment having the above-described configuration, the following effects are obtained.

  Lubricating oil that reaches the periphery of the worm shaft 47 flows into the gap δ between the ring 55 and the bearing 50 through the bearing 50. The pressure of the lubricating oil flowing into the gap δ is reduced by the ring 55 (pressure reducing portion), and the pressure of the lubricating oil does not directly act on the oil seal 52, and the lip 52a of the oil seal 52 is caused by the pressure of the lubricating oil. Prevents deformation. The lubricating oil whose pressure has been reduced passes through the gap Δ between the inner peripheral surface of the ring 55 and the outer peripheral surface of the worm shaft 47, reaches the filter 53, and is further filtered to wear powder when passing through the filter 53. Is removed. Then, clean lubricating oil that has been filtered by the filter 53 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 52a of the oil seal 52 and the worm shaft 47, and the sliding portion is appropriately lubricated. This can reduce wear of the lip 52a of the oil seal 52 due to wear powder and deformation of the lip 52a of the oil seal 52 due to the pressure of the lubricating oil. Moreover, since the thin plate-like filter 53 has the reinforcing plates 54 on both side surfaces, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, by preventing the deformation of the filter 53 due to the pressure of the lubricating oil, it is possible to prevent the lubricating oil mixed with wear powder from entering the sliding portion between the lip 52a of the oil seal 52 and the worm shaft 47. As a result, the life of the oil seal 52 can be extended, and as a result, the life of the geared motor 31 can be extended.

  Further, the lubricating oil reaching the periphery of the output shaft 49 flows into the gap δ between the extension portion 44 a of the one bearing bracket 44 and the bearing 51 through the bearing 51. The pressure of the lubricating oil flowing into the gap δ is reduced by the extension 44 a (pressure reducing portion) of one bearing bracket 44, and the pressure of the lubricating oil does not directly act on the oil seal 56, and the lip of the oil seal 56 56a is prevented from being deformed by the pressure of the lubricating oil. The reduced-pressure lubricating oil passes through the gap Δ between the inner peripheral surface of the extension portion 44 a and the outer peripheral surface of the output shaft 49, reaches the filter 57, and is filtered and worn when passing through the filter 57. The powder is removed. Then, clean lubricating oil that has been filtered by the filter 57 and from which abrasion powder has been removed is supplied to the sliding portion between the lip 56a of the oil seal 56 and the output shaft 49, and the sliding portion is appropriately lubricated. As a result, wear of the lip 56a of the oil seal 56 due to wear powder and deformation of the lip 56a of the oil seal 56 due to lubricating oil pressure can be reduced. Moreover, since the thin plate-like filter 57 has the reinforcing plate 58 on one side surface, it can be prevented from being deformed by the pressure of the lubricating oil. Therefore, by preventing the deformation of the filter 57 due to the pressure of the lubricating oil, it is possible to prevent the lubricating oil mixed with wear powder from entering the sliding portion between the lip 56a of the oil seal 56 and the output shaft 49. As a result, the life of the oil seal 56 can be extended, and as a result, the life of the geared motor 31 can be extended.

  In the first and second embodiments, an example in which lubricating oil is used as the lubricant (oil bath lubrication type) is shown, but the shaft seal structure of the gear reducer of the present invention uses grease as the lubricant. It can also be applied to the case (grease bath lubrication).

  Moreover, although the said Example 1, 2 has shown the example applied to the geared motor, the shaft seal part structure of the gear reducer of this invention is applicable also to a single gear reducer.

It is a front view including the partial cross section of the geared motor which concerns on Example 1 of this invention. It is principal part sectional drawing in the frame A shown in FIG. It is a side view including a partial cross section of the geared motor shown in FIG. It is principal part sectional drawing in the frame B shown in FIG. It is principal part sectional drawing in the frame C shown in FIG. It is a front view including the partial cross section of the geared motor which concerns on Example 2 of this invention. It is principal part sectional drawing in the frame D shown in FIG. It is a side view including a partial cross section of the geared motor shown in FIG. It is principal part sectional drawing in the frame E shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geared motor 2 Motor part 3 Load side bearing bracket 3a Extension part (pressure reduction part)
4 Motor shaft (input shaft)
5 Frame 6 Load side bearing 7 Worm 8 Oil seal 8a Lip 8b Dust cover 8c Garter spring 9 Filter 10 Reinforcement plate 12 Reduction gear part 13 Gear case 13a Extension part (pressure reduction part)
13 'Bearing bracket 13'a Extension part (pressure reduction part)
14 gear box 15 worm wheel 16 output shaft 17, 17 'bearing 18, 18' oil seal 18a, 18'a lip 18b, 18'b dust guard 18c, 18'c garter spring 19, 19 'filter 20, 20' Reinforcing plate 31 Geared motor 32 Motor section 33 Load-side bearing bracket 34 Motor shaft (input shaft)
35 Frame 36 Load side bearing 42 Reduction gear part 43 Gear case 44 Bearing bracket 44a Extension part (pressure reduction part)
45 gear box 46 worm 47 worm shaft 48 worm wheel 49 output shaft 50 bearing 51 bearing 52 oil seal 52a lip 52b dust guard 52c garter spring 53 filter 54 reinforcing plate 55 ring (pressure reducing portion)
56 Oil seal 56a Lip 56b Dust guard 56c Garter spring 57 Filter 58 Reinforcement plate Δ Gap δ Gap

Claims (2)

A gear reduction mechanism is built in the gear box, a lubricant for lubricating the gear reduction mechanism is enclosed in the gear box, and leakage of the lubricant from the rotating shaft constituting the gear reduction mechanism is sealed with an oil seal. In the shaft seal structure of the gear reducer,
The shaft seal part structure of the gear reducer includes the oil seal, a filter that filters the lubricant, and a pressure reducing part that opposes the outer peripheral surface of the rotating shaft via a gap and reduces the pressure of the lubricant. A shaft of a gear reducer, wherein the pressure reduction portion is located closer to the gear reduction mechanism than the oil seal, and the filter is located between the oil seal and the pressure reduction portion. Seal structure.   The shaft seal structure of a gear reducer according to claim 1, wherein the filter has a reinforcing plate on at least one side surface.

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