JP6362559B2 - Rotating device - Google Patents

Description

  The present invention relates to a rotating device.

  Patent Document 1 discloses a rotating device that includes a casing in which a lubricant is sealed and a rotating shaft that is rotatably supported by the casing.

  In recent years, in order to strictly prevent the leakage of lubricant, there is an increasing need for a rotating device with a higher sealing degree of the casing. In the rotating device disclosed in Patent Document 1, two oil seals are arranged in parallel in the axial direction between the outer periphery of the rotating shaft and the inner periphery of the casing, and sealing between the casing and the rotating shaft is performed. Increasing degree.

Japanese Patent No. 2866247 (FIG. 2)

  For a rotating device with a higher degree of sealing of the casing, the ambient temperature when the rotating device is assembled, the geographical altitude (elevation) where the rotating device is assembled, or the atmospheric pressure when the rotating device is assembled Etc., the initial internal pressure of the rotating device is substantially fixed.

  However, the rotating device needs to have a sealing performance that can withstand a differential pressure between an external atmospheric pressure (atmospheric pressure) at a place where the rotating device is actually used and an internal pressure greatly increased due to a temperature increase during operation. For this reason, the burden of sealing members, such as an oil seal which seals a casing, is large, and became a factor of the lifetime reduction of this sealing member.

  The present invention has been made to solve such a conventional problem, and an object thereof is to provide a rotating device that can further improve the life of the seal member.

  The present invention provides a rotating device including a casing in which a lubricant is enclosed, and a rotating shaft rotatably supported by the casing, and a lubricant swinging plate that rotates integrally with the rotating shaft; A fixed wall member integrated with the casing and facing the swing plate in the axial direction; a space on the side of the fixed wall member opposite to the swing plate; a first space; a space between the fixed wall member and the swing plate. An air vent mechanism that communicates the first space and the external space of the rotating device, and a communication passage that communicates the first space and the second space when the second space is defined. Thus, the above-described problems are solved.

  In the rotating device according to the present invention, the air in the casing can escape to the outside of the rotating device via the communication path and the air vent mechanism. On the other hand, the lubricant is suppressed from being pushed toward the communication path by the swinging plate, and is further prevented from flowing out of the rotating device by the fixed wall member.

  Therefore, the burden on the seal member such as an oil seal can be reduced, and the life of the seal member can be improved.

  According to the present invention, the life of the seal member of the rotating device can be further improved.

Front sectional view showing a configuration example of a hypoid gear motor (rotating device) according to an example of an embodiment of the present invention Same side sectional view Front view of the joint cover body in the above embodiment Cross-sectional view of the main part of FIG. The principal part expanded sectional view which expands further and shows the principal part of FIG. The front view of the joint cover body in an example of other embodiments of the present invention FIG. 4 is a cross-sectional view of the main part corresponding to FIG. 4 showing the main part of the other embodiment. The principal part expanded sectional view equivalent to FIG. 5 which further expands the principal part of FIG.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a front sectional view showing a configuration example of a hypoid gear motor (rotating device) according to an example of an embodiment of the present invention, FIG. 2 is a side sectional view of the same, and FIG. 3 is a joint cover body in the above embodiment. It is a front view.

  The hypoid gear motor 12 includes a motor 14 and a speed reducer 16. The hypoid gear motor 12 according to the present embodiment is installed in a state where the motor 14 is directed upward in the vertical direction. In addition, the reduction gear 16 of FIG. 1 depicts the 1A-1A cross-section part of FIG.

  The motor 14 includes a stator 18, a rotor 20, and a motor shaft 22 (rotary shaft) integrated with the rotor 20. The motor shaft 22 also serves as the input shaft of the speed reducer 16.

  The reduction gear 16 has a hypoid gear set 24 and a parallel shaft gear set 26. The hypoid gear set 24 includes a hypoid pinion 28 that is directly cut into an input shaft integrated with the motor shaft 22, and a hypoid gear 30 that meshes with the hypoid pinion 28. The parallel shaft gear set 26 includes an intermediate gear 34 fixed to the intermediate shaft 32 to which the hypoid gear 30 is fixed, and an output gear 36 that meshes with the intermediate gear 34. The output gear 36 is formed integrally with the output shaft 38 of the speed reducer 16 (there may be a separate body).

  The casing 50 of the hypoid gear motor 12 includes a motor casing body 51, a motor cover body 52, a reduction gear casing body 53, a reduction gear lid body 54, and a joint cover body 55.

  The motor casing body 51 has a cylindrical shape as a whole, is integrated with the stator 18 of the motor 14, and houses the rotor 20 of the motor 14. The motor cover body 52 covers the anti-load side of the motor casing body 51 in the axial direction and supports the anti-load side of the motor shaft 22 via the anti-load side bearing 64.

  The reduction gear casing body 53 accommodates the hypoid gear set 24 and the parallel shaft gear set 26 of the reduction gear 16. The speed reducer casing body 53 is formed in a cylindrical shape as a whole, the axially opposite motor side is closed, and a part of the side portion is greatly opened. The reduction gear cover 54 covers the opened portion of the side portion of the reduction gear casing 53.

  The motor casing body 51 and the reduction gear casing body 53 are connected via a joint cover body 55. That is, the joint cover body 55 has both a function of a cover body that covers the axial load side of the motor 14 and a function of a cover body that covers the axially opposite load side of the speed reducer 16.

  The motor casing body 51, the motor cover body 52, and the joint cover body 55 are coupled together by a through bolt 66. The reduction gear casing body 53 and the reduction gear lid body 54 are connected via a connection bolt 68. The joint cover body 55 and the reduction gear casing body 53 are connected by a connecting bolt 74.

  A lubricant (which may be grease: oil in this embodiment) is enclosed in the reducer space PG1 formed by the reducer casing body 53, the reducer lid body 54, and the joint cover body 55. That is, the reduction gear space PG1 is a sealed space that should be sealed.

  In order to secure the sealed state of the reduction gear space PG1, an O-ring 76 is disposed between the reduction gear casing body 53 and the reduction gear cover body 54. An O-ring 78 is disposed between the speed reducer casing body 53 and the joint cover body 55. An oil seal 81 is disposed between the joint cover body 55 and the motor shaft 22. An oil seal 73 is disposed between the output shaft 38 and the speed reducer casing body 53. An oil seal 75 is disposed between the output shaft 38 and the speed reducer lid 54.

  The oil seal 81 has a U-shaped cross section parallel to the shaft. The oil seal 81 has a U-shaped open side facing the inner side of the speed reducer 16 because of the seal characteristic that “the lubricant in the speed reducer space PG1 does not leak to the motor 14 side”. In this embodiment, two oil seals 81 are arranged side by side in the axial direction on the oil seal mounting portion 92 of the motor shaft 22 in order to ensure a high degree of sealing of the reduction gear space PG1.

  Hereinafter, the configuration of the sealing structure in the vicinity of the oil seal 81 of the motor shaft 22 will be described in detail with reference to FIGS. 4 and 5 together. 4 is a cross-sectional view of the main part of FIG. 1, and FIG. 5 is an enlarged cross-sectional view of the main part further showing the main part of FIG.

  The hypoid gear motor 12 (rotating device) according to the present embodiment includes a lubricant swing plate 82 that rotates integrally with the motor shaft 22 (rotating shaft).

  In this embodiment, the swing plate 82 is formed of a disk-like member concentric with the motor shaft 22. The outer diameter of the built-in portion 22F of the swing plate 82 on the motor shaft 22 is smaller than the outer diameter of the oil seal mounting portion 92. The swing plate 82 includes a step surface 93 perpendicular to the shaft formed by the difference between the outer diameter of the oil seal mounting portion 92 of the motor shaft 22 and the outer diameter of the built-in portion 22F, and a stopper formed on the motor shaft 22. It is clamped by a retaining ring 91 fitted in the annular groove 94.

  The swing plate 82 is incorporated into the motor shaft 22 by an interference fit, and the swing plate 82 can rotate integrally with the motor shaft 22. A retaining ring 91 is attached to prevent the swing plate 82 from coming off.

  Further, the hypoid gear motor 12 according to this embodiment includes a fixed wall member 62 that is integrated with the joint cover body 55 of the casing 50 and faces the swing plate 82 in the axial direction.

  First, the configuration of the joint cover body 55 will be described.

  FIG. 3 shows the joint cover body 55. In FIG. 3, the corresponding positions of grooves 99 described later are also indicated by imaginary lines. The joint cover body 55 includes a substantially cylindrical joint cover body 55A, four joint cover ears 70 formed in a square shape projecting radially outward from the joint cover body 55A, and a diameter from the joint cover body 55A. 8 ribs 96 formed toward the inner side in the direction, and a load side bearing arrangement portion 58 and an oil seal arrangement portion 60 formed at the inner end portion of the rib 96 (that is, the inner side in the radial direction of the joint cover main body 55A) have.

  Here, the “joint cover main body 55A (casing main body)” refers to a cylindrical portion on the outer periphery that partitions the inside and the outside of the hypoid gear motor 12 in the joint cover body 55 (casing).

  The load side bearing placement portion 58 of the joint cover body 55 faces the load side bearing placement portion 88 of the motor shaft 22. The load side bearing arrangement portion 58 accommodates the load side bearing 90 on the radially inner side of the joint cover body 55 </ b> A of the joint cover body 55.

  The oil seal disposing portion 60 of the joint cover body 55 integrally includes a radial accommodating portion 60A that contacts the outer periphery of the oil seal 81 and an axial accommodating portion 60B that contacts the axial load side end of the oil seal 81. In preparation.

  The radial direction accommodation portion 60 </ b> A of the oil seal arrangement portion 60 is formed in a ring shape (cylindrical shape) concentric with the motor shaft 22, and is in contact with the fixed wall member 62. That is, the oil seal arrangement portion 60 has a ring-shaped portion that comes into contact with the fixed wall member 62. The radial accommodating portion 60 </ b> A faces the oil seal placement portion 92 of the motor shaft 22.

  The axial accommodation portion 60B of the oil seal arrangement portion 60 extends perpendicularly to the shaft from the axial load side end of the radial accommodation portion 60A toward the radial inner side. The axial accommodation portion 60 </ b> B faces the outer periphery of the motor shaft 22 with a slight gap, and substantially shields the axial load side end portion of the oil seal 81. The axial accommodating portion 60B is also in contact with the fixed wall member 62.

  In addition, the joint cover body 55 in this embodiment is provided with a plurality of ribs 96 in the circumferential direction between the joint cover main body 55A and the oil seal arrangement portion 60. The rib 96 has a rib through-hole 98 that contacts the fixed wall member 62 and communicates the space between the rib 96 and the rib 96 (first space P1 described later).

  The fixed wall member 62 is fixed to the axial end portion 55B of the joint cover body 55A of the joint cover body 55 having such a configuration via a locking bolt 95. The locking bolt 95 is screwed into the tap hole 87 of the joint cover body 55A. That is, the fixed wall member 62 is integrated with the joint cover body 55 of the casing 50.

  The fixed wall member 62 is constituted by a disk-shaped member having a through hole 62 </ b> A concentric with the motor shaft 22. The fixed wall member 62 is disposed on the axially opposite load side of the swing plate 82 and faces the swing plate 82 with a gap of δ (62-82) in the axial direction.

  Now, the space on the counter-swing plate side of the fixed wall member 62 is referred to as a first space P1, and the space between the fixed wall member 62 and the swing plate 82 is referred to as a second space P2.

  The hypoid gear motor 12 includes an air breather 84 (air venting mechanism) that allows the first space P1 and the outer space PE1 of the hypoid gear motor 12 to communicate with each other.

  The air breather 84 is attached to the joint cover body 55A by screwing. The air breather 84 is known per se and communicates the first space P1 and the external space PE1 through a filter (not shown). The air breather 84 has a function of allowing the pressure of the first space P1 to coincide with the pressure value of the external space PE1 while capturing dust and the like by allowing air to pass through the filter. Since the first space P1 communicates with the speed reducer space PG1 via the second space P2, the function of the air breather 84 results in that the pressure in the speed reducer space PG1 is maintained at the pressure in the external space PE1. become. Reference numeral 85 denotes an air passage hole for communicating the first space P1 with the external space PE1 through the air breather 84.

  The hypoid gear motor 12 includes a communication path 86 that allows the first space P1 and the second space P2 to communicate with each other.

  Specifically, a wall member gap 97 is formed between the through hole 62 </ b> A of the fixed wall member 62 and the outer periphery of the motor shaft 22. The wall member gap 97 constitutes a part of the communication passage 86 that communicates the first space P1 and the second space P2.

  In addition, a groove 99 extending from the radially inner end of the fixed wall member 62 toward the radially outer side is formed on the axial end surface of the fixed wall member 62 on the counter-swing plate side. In other words, a gap formed by the groove 99 is provided in at least one of the oil seal arrangement portion 60 and the fixed wall member 62 (in this example, the fixed wall member 62 side). One groove 99 is formed from the inner end of the fixed wall member 62 toward the radially outer side (a plurality of grooves 99 may be formed). The groove 99 extends to a position radially outside of the oil seal arrangement portion 60. The groove 99 also constitutes a part of the communication path 86 that communicates the first space P1 and the second space P2.

  As described above, in this hypoid gear motor 12, the oil seal 81 is disposed between the joint cover body 55 and the motor shaft 22 on the anti-swing plate side of the fixed wall member 62. The joint cover body 55 has an oil seal placement portion 60 formed on the radially inner side of the joint cover body 55A, and a first space P1 is formed between the oil seal placement portion 60 and the joint cover body 55A. Yes. Further, a gap (groove 99) is provided between the oil seal arrangement portion 60 and the fixed wall member 62, and the gap constitutes a part of the communication path 86 that communicates the first space P1 and the second space P2. doing. The reduction gear space PG <b> 1 and the first space P <b> 1 are separated by the fixed wall member 62 and communicate only through the communication path 86.

  In addition, the motor shaft 22 of the outermost portion 62A1 of the opening on the second space P2 side of the communication path 86 (in this embodiment, a ring-shaped opening between the inner periphery of the through hole 62A and the outer periphery of the motor shaft 22). The radial dimension from the axis C22 is r62A1. The radial dimension of the outermost portion 82A of the swing plate 82 from the axis C22 of the motor shaft 22 is r82A, and r62A1 <r82A. That is, the outermost part 62A1 of the through hole 62A that is the outermost part of the opening on the second space P2 side of the communication path 86 is located on the radially inner side with respect to the outermost part 82A of the swing plate 82.

  Next, the operation of the hypoid gear motor 12 will be described.

  In the hypoid gear motor 12, when the motor shaft 22 of the motor 14 rotates, the hypoid pinion 28 formed at the tip of the motor shaft 22 rotates, and the hypoid gear 30 meshing with the hypoid pinion 28 rotates. As a result, the first stage of deceleration is performed and the rotation direction is converted to a right angle direction.

  The intermediate shaft 32 is rotated by the rotation of the hypoid gear 30, and a second speed reduction is performed by the engagement of the intermediate gear 34 and the output gear 36 fixed to the intermediate shaft 32. As the output gear 36 rotates, the output shaft 38 rotates. As a result, a not-shown driven device (mating machine) connected to the output shaft 38 can be driven.

  The casing 50 of the hypoid gear motor 12 is sealed by O-rings 76 and 78 and oil seals 73, 75 and 81. For this reason, as for the hypoid gear motor 12, the atmospheric | air pressure in the reduction gear space PG1 rises by the heat_generation | fever accompanying driving | operation.

  The increase in the atmospheric pressure in the reduction gear space PG1 increases as the sealing degree of the casing 50 increases. In a state where the atmospheric pressure in the speed reducer space PG1 is high, a large pressure is applied to the lubricant itself, and the lubricant tends to flow in the speed reducer 16 with a large pressure.

  On the other hand, the open side of the oil seal 81 having a U-shaped cross section faces the inside of the speed reducer 16 due to the characteristics of the seal. For this reason, when the lubricant presses against the oil seal 81 with a strong pressure in such a high internal pressure, the lubricant is pushed into the U-shaped interior of the oil seal 81 and the lubricant applied to the oil seal 81 The pressure tends to increase further. The strong pressure of the lubricant applied to the oil seal 81 increases the contact surface pressure of the oil seal 81 with respect to the motor shaft 22 and causes the life of the oil seal 81 to decrease due to an increase in sliding resistance.

  However, in the hypoid gear motor 12 according to the present embodiment, the swing plate 82 is provided on the inner side in the axial direction of the oil seal 81 (inside the reduction gear 16: on the sealing space side of the rotating shaft). Since the swing plate 82 rotates integrally with the motor shaft 22, even if the lubricant is pushed toward the oil seal 81, the lubricant can be blown radially outward by the rotation (centrifugal force) of the swing plate 82. Yes (FIG. 5, arrow G1). Therefore, the lubricant that has been pushed in is prevented from being pushed into the U-shaped section of the oil seal 81 with a strong pressure.

  The fixed wall member 62 is opposed to the swing plate 82 in the axial direction with a gap δ (62-82), and a second space P2 is formed between the fixed wall member 62 and the swing plate 82. It is secured. Therefore, the air in the reduction gear space PG1 can get over the outermost portion 82A of the swing plate 82 and enter the second space P2 side (arrow A1).

  The second space P <b> 2 communicates with the first space P <b> 1 (the space on the counter-swing plate side of the fixed wall member 62) via the communication path 86 constituted by the wall member gap 97 and the groove 99. Therefore, the air that has entered the second space P2 can further move from the second space P2 to the first space P1 via the communication path 86 (wall member gap 97 and groove 99) (arrow A2). The first space P1 (the space where the air breather 84 exists) can be reached (arrow A3).

  When the pressure in the first space P1 rises, the air breather 84 releases the air in the first space P1 to the external space PE1. Therefore, the inside of the reduction gear space PG1 is always maintained at a pressure equal to the atmospheric pressure of the external space PE1 by the function of the air breather 84.

  That is, in the present embodiment, it is possible to prevent the lubricant from pressing strongly against the oil seal 81 while maintaining the sealing degree of the reduction gear space PG1 sufficiently high, and to reduce the pressure in the reduction gear space PG1. The ascent can be avoided by letting air to the outside via the air breather 84.

  As a result, the pressure fluctuation in the reducer space PG1 is reduced, and the life of the oil seal 81 can be further extended. In addition, since an oil seal having a smaller pressure resistance function can be used, the cost can be reduced and the sliding resistance between the oil seal 81 and the motor shaft 22 can be reduced, so that the operation efficiency is also improved.

  Even if the oil seal 81 is damaged, the pressure difference between both sides of the oil seal 81 is small, so that the lubricant (grease) cannot obtain a force to pass through the oil seal 81, and the amount of leakage Can be reduced.

  Even if a part of the lubricant gets over the outermost part 82A of the swing plate 82, the lubricant adheres to any part in the circumferential direction near the outer periphery of the swing plate 82 in the second space P2. Can stay. Therefore, it is possible to prevent the communication path 86 from being blocked by the lubricant over a long period of time. When the lubricant is composed of viscous grease as in the present embodiment, generally when the air is discharged, “the grease tends to block the air passage as the operation progresses”, “ "It is easy for grease to come out together with this". However, in this embodiment, only air can be discharged well over a long period of time.

  The swing plate 82 is incorporated in the motor shaft 22 by the retaining ring 91 and can be disassembled. Therefore, the lubricant accumulated in the second space P2 can be easily removed during maintenance.

  Further, since the fixed wall member 62 is also fixed to the joint cover body 55 by the locking bolt 95, it can be disassembled. Therefore, it is also possible to remove the lubricant adhered in the groove 99 as necessary.

  In addition to the above basic operational effects, in the present embodiment, the outermost portion 62A1 of the opening on the second space P2 side of the communication path 86 is further located on the radially inner side than the outermost portion 82A of the swing plate 82. Yes. Therefore, the lubricant is more reliably prevented from being swung off by the swing-off plate 82 and more reliably prevented from entering the communication path 86 via the second space P2.

  In this embodiment, an oil seal 81 is disposed between the casing 50 and the motor shaft 22 on the side of the fixed wall member 62 facing away from the swing plate. The casing 50 has an oil seal arrangement portion 60 formed on the radially inner side of the casing main body (specifically, the joint cover main body 55A), and between the oil seal arrangement portion 60 and the joint cover main body 55A. A first space P1 is formed. A gap (specifically, a groove 99) is provided between the oil seal arrangement portion 60 and the fixed wall member 62, and the groove 99 constitutes a part of the communication path 86.

  With this series of configurations, the air that has passed over the swing plate 82 passes between the oil seal placement portion 60 and the joint cover body 55A via a gap (groove 99) between the oil seal placement portion 60 and the fixed wall member 62. It can flow into the 1st space P1 located in. For this reason, air can smoothly reach the first space P <b> 1 in which the air breather 84 is disposed without interfering with the oil seal 81.

  Further, in the present embodiment, the oil seal arrangement part 60 has a ring-shaped part (radial direction accommodation part 60 </ b> A) that contacts the fixed wall member 62. In addition, a gap (groove 99) that connects the first space P1 and the second space P2 is formed in at least one of the oil seal arrangement portion 60 and the fixed wall member 62 (in this example, the fixed wall member 62 side). The groove 99 constitutes a part of the communication path 86.

  As a result, even if the lubricant climbs over the swing plate 82 and enters the second space P2, the lubricant is caused by the ring-shaped portion of the oil seal arrangement portion 60 that is in contact with the fixed wall member 62. The flow to the one space P1 side is greatly hindered. On the other hand, the air can favorably move to the first space P1 side, bypassing the ring-shaped portion of the oil seal arrangement portion 60 through a gap communicating the first space P1 and the second space P2. .

  In this embodiment, the groove 99 that forms the gap between the oil seal placement portion 60 and the fixed wall member 62 is formed on the fixed wall member 62 side. Instead of (or in addition to) 99, a groove 99 may be formed on the oil seal arrangement portion 60 side. Alternatively, instead of “grooves”, “holes” that connect the first space P1 and the second space P2 may be formed in at least one of the oil seal arrangement portion 60 and the fixed wall member 62.

  In the present embodiment, a plurality of ribs 96 are provided in the circumferential direction between the joint cover main body 55A and the oil seal arrangement portion 60, and the ribs 96 abut against the fixed wall member 62, and the ribs A rib through-hole 98 is formed to communicate the space (first space P <b> 1) between 96 and the rib 96.

  As a result, the structural reinforcement effect by the rib 96 can be ensured, and the air that has passed through the groove 99 can be smoothly spread into the first space P1, and the operation of the air breather 84 with respect to the pressure of the first space P1 is further improved. It will be possible to perform properly.

  6 to 8 show an example of another embodiment of the present invention.

  FIG. 6 is a front view of the joint cover body in an example of the other embodiment, FIG. 7 is a cross-sectional view of the main part corresponding to FIG. 4 showing the main part of the other embodiment, and FIG. It is a principal part expanded sectional view equivalent to FIG. 5 which expands and shows a part.

  The hypoid gear motor 112 according to this embodiment is also integrated with the lubricant swing plate 82 rotating integrally with the motor shaft 22 and the joint cover body 155 of the casing 150, and is fixed to the swing plate 82 in the axial direction. Member 162.

  Then, when the space on the counter-swing plate side of the fixed wall member 162 is the first space P101 and the space between the fixed wall member 162 and the swing plate 82 is the second space P102, the first space P101 and the external space An air breather 84 (air venting mechanism) that communicates with the PE 101 and a communication passage 186 that communicates the first space P101 and the second space P102 are provided.

  However, in this embodiment, the oil seal arrangement portion 160 is not brought into contact with the fixed wall member 162. That is, a gap 199 that makes one round in the circumferential direction is formed between the oil seal placement portion 160 and the fixed wall member 162 with an axial width of δ (160-162). The gap 199 constitutes a part of the communication path 186 that communicates the first space P101 and the second space P102. As in the previous embodiment, the gap 197 between the fixed wall member 162 and the motor shaft 22 also constitutes a part of the communication path 186.

  In this embodiment, the rib 196 also has the same axial width as the axial width of δ (160-162) of the gap 199 (not the rib through hole 98 as in the previous embodiment). Thus, a rib gap 198 that goes around in the circumferential direction is formed.

  In this embodiment, only one oil seal 81 (not two) is provided to reduce the cost. Further, the oil seal arrangement portion 160 of the joint cover body 155 has only the radial direction accommodation portion 160A, and does not have (is configured to have) the axial direction accommodation portion (had in the previous embodiment). May be)

  Also in this embodiment, the same effect as the previous embodiment can be obtained. Specifically, since the swing plate 82 rotates integrally with the motor shaft 22, even if the lubricant in the speed reducer space PG1 approaches the oil seal 81 side, the swing plate 82 causes the lubricant to be radially discharged. It can be blown outward (FIG. 8, arrow G1). Therefore, the lubricant that has been pushed in is prevented from being pushed into the U-shaped section of the oil seal 81 with a strong pressure.

  Further, the fixed wall member 162 faces the swing plate 82 in the axial direction, and a second space P102 is secured between the swing plate 82 and the fixed wall member 162. Therefore, the air in the reducer space PG1 can get over the outermost part 82A of the swing plate 82 and enter the second space P102 side (arrow A101).

  Further, a gap 197 is formed between the fixed wall member 162 and the motor shaft 22, and a gap 199 that makes one round in the circumferential direction is formed between the oil seal placement portion 160 and the fixed wall member 162. ing. The gaps 197 and 199 constitute a communication path 186 that communicates the first space P101 and the second space P102. Therefore, the air of the hypoid gear motor 112 can further move from the second space P102 to the first space P101 via the communication path 186 (arrow A102), and can reach the air breather 84 (arrow A102, A103).

  That is, according to the present embodiment, it is possible to prevent the lubricant from pressing strongly against the oil seal 81 while maintaining the sealing degree of the reduction gear 16 sufficiently high, and to increase the pressure in the reduction gear space PG1. Can be relaxed.

  Since other configurations are the same as those of the previous embodiment, the same reference numerals as those of the previous embodiment are given to the same or functionally similar parts in the drawing, and the duplicate description is omitted.

  In the above embodiment, the swing plate is made of a disk-shaped member, and the outermost portion of the opening on the second space side of the communication path is positioned radially inward from the outermost portion of the swing plate. Thus, the swing-off effect of the lubricant on the swing-off plate is further enhanced. However, in the present invention, the size and shape of the swing plate, and further the shape of the communication path are not particularly limited to the above example.

  In the above embodiment, the fixed wall member (configured separately) is integrated with the casing main body via the locking bolt. However, the fixed wall member is integrated with the casing main body from the beginning. It may be made.

  In the above embodiment, the air breather is arranged as the air venting mechanism. However, the air venting mechanism only needs to have a function of venting air that communicates with the external space, and it is necessary to configure the air breather. There is no. For example, the air vent mechanism may be configured by a bent tube that is bent and extended from the first space to the outside space, or may be a simple hole.

  Moreover, in the said embodiment, although this invention was applied to the input shaft part of the reduction gear, you may apply to shaft parts other than an input shaft, for example, an output shaft part.

  Moreover, in the said embodiment, although the reduction gear was illustrated as a rotation apparatus, the rotation apparatus which concerns on this invention is not limited to this. In short, the present invention can be applied to any rotating device that includes a casing in which a lubricant is sealed and a rotating shaft that is rotatably supported by the casing.

12 ... Hypoid gear motor (rotating device)
14 ... motor 16 ... speed reducer 22 ... motor shaft (rotating shaft)
50 ... Casing 55 ... Joint cover body 55A ... Joint cover body (casing body)
DESCRIPTION OF SYMBOLS 60 ... Oil seal arrangement | positioning part 62 ... Fixed wall member 81 ... Oil seal 82 ... Swing plate 84 ... Air breather (air venting mechanism)
86 ... Communication passage 96 ... Rib 97 ... Wall member gap 98 ... Rib through hole 99 ... Groove (gap)
P1 ... 1st space P2 ... 2nd space PE1 ... External space PG1 ... Reducer space

Claims (5)

In a rotating device comprising a casing in which a lubricant is enclosed, and a rotating shaft rotatably supported by the casing,
A lubricant swing plate rotating integrally with the rotating shaft;
A fixed wall member integrated with the casing and facing the swing plate in the axial direction;
When the space on the anti-swing plate side of the fixed wall member is a first space, and the space between the fixed wall member and the swing plate is a second space,
An air vent mechanism that communicates the first space with an external space of the rotating device;
A rotation device comprising: a communication path that communicates the first space and the second space. In claim 1,
The rotating device, wherein the outermost part of the opening on the second space side of the communication path is located radially inside the outermost part of the swinging plate. In claim 1 or 2,
An oil seal is disposed between the casing and the rotating shaft on the anti-swing plate side of the fixed wall member,
The casing has a casing main body and an oil seal arrangement portion formed on the radially inner side of the casing main body,
The first space is formed between the oil seal arrangement portion and the casing body,
A gap is provided between the oil seal arrangement portion and the fixed wall member,
The gap comprises at least a part of the communication path. In claim 3,
The oil seal arrangement portion has a ring-shaped portion that comes into contact with the fixed wall member,
At least one of the oil seal arrangement portion and the fixed wall member is formed with a groove or a hole communicating the first space and the second space and forming the gap. In claim 3 or 4,
A plurality of ribs are provided in the circumferential direction between the casing body and the oil seal arrangement portion,
The rib has a rib through-hole that contacts the fixed wall member and communicates the space between the rib.

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