JP6575167B2 - Non-contact type sealing device for gears for railway vehicles - Google Patents

Description

  The present invention relates to a non-contact type sealing device in a gear device for a railway vehicle that decelerates a driving force generated by an electric motor and transmits it to a wheel.

  As shown in FIG. 4, the railway vehicle transmits the driving force generated by the electric motor to the small gear shaft 2 of the gear device 1 via the shaft coupling, and the small gear 3 formed on the outer periphery of the small gear shaft 2. It transmits to the wheel attached to the axle 5 via the meshing large gear 4 and travels.

  In the gear device 1, the lubricating oil 7 in the casing 6 in which the small gear 3 and the large gear 4 are housed is swept up by the rotation of the large gear 4, so that the meshing portion A of the large gear 4 and the small gear 3 and the axle 5 The bearings 8 and 9 supporting the small gear shaft 2 are lubricated.

  However, in order to supply sufficient lubricating oil 7 to the bearings 8 and 9, it is necessary to secure a sufficient amount of lubricating oil 7 in the casing 6. At this time, it is necessary that the lubricating oil 7 supplied to the bearings 8 and 9 lubricates the bearings 8 and 9 and then returns to the inside of the casing 6 to prevent leakage from the bearings 8 and 9 to the outside.

  Therefore, in the gear device 1 for railway vehicles, a shaft seal device is provided in a portion where the small gear shaft 2 and the axle 5 protrude through the casing 6.

  The shaft seal device of a rotating shaft such as a transport machine is classified into a non-contact seal in which the rotating shaft and the casing portion do not contact, and a contact seal that ensures a sealing function by contacting the rotating shaft and the casing through a resin member or the like. Both are used properly according to the usage environment of the apparatus.

  In a gear device for a railway vehicle, a non-contact seal is adopted as a shaft seal device for a portion where a small gear shaft or an axle protrudes through a casing.

  However, in the non-contact seal, when a pressure difference occurs between the inside and outside of the casing, a gas flow is generated in the flow path of the non-contact seal, and the lubricating oil remaining inside is transported by shear due to the gas flow and is transferred to the outside of the casing. Leakage problems may occur.

  The cause of the pressure difference between the inside and outside of the casing is a pressure increase due to a rise in the internal temperature of the casing, a pressure drop outside the casing due to entry into the tunnel or passing between trains, a pressure drop due to the rotational centrifugal force of the shaft coupling member, etc. Can be considered.

  In order to avoid the trouble of leakage of the lubricating oil, the multi-contact labyrinth flow path is formed in the region extending from the bearings 9 and 8 of the small gear shaft 2 and the axle 5 to the outside of the casing 6 as shown in FIG. The labyrinth seal which lengthens the channel | path which connects the inside and outside of the casing 6 by providing 10, and improves the sealing effect is employ | adopted a lot.

  Further, as shown in FIG. 6, by providing a projection called a slinger 11 in a region extending from the bearings 9 and 8 of the small gear shaft 2 and the axle 5 to the outside of the casing 6, along the small gear shaft 2 and the axle 5. A structure is adopted in which the lubricating oil that has flowed out is shaken off by centrifugal force and the lubricating oil is returned to the casing 6.

  In the railway vehicle gear unit, as shown in FIG. 7, lubricating oil from the inside of the casing 6 is provided by a non-contact seal provided with both the multi-stage labyrinth flow path 10 shown in FIG. 4 and the slinger 11 shown in FIG. There are many which suppress the leakage of this (for example, refer patent document 1, 2). In FIG. 7, reference numeral 12 denotes a bearing lid, and 13 denotes a rotating sleeve attached to the axle 5.

  However, the basic design guideline of providing a multi-stage labyrinth flow path and slinger alone or both of them essentially prevents leakage of lubricating oil when a certain amount or more of lubricating oil enters from the inside of the casing. I can't.

Japanese Patent No. 5131968 Japanese Patent Publication No. 6-63573

  The problem to be solved by the present invention is that a non-contact type seal device in which a multi-stage labyrinth flow path and a slinger are provided alone or together with each other, as in a conventional railway vehicle gear device, is provided from the inside of the casing. When a certain amount or more of lubricating oil has infiltrated, leakage of the lubricating oil cannot be essentially prevented.

  In order to further improve the sealing performance of the non-contact type sealing device in the railway vehicle gear device, the inventors conducted a more detailed verification of the flow of oil droplets in the labyrinth seal by performing a multiphase flow numerical analysis described later.

  As a result, it was found that when a large amount of lubricating oil entered the non-contact type seal, the lubricating oil that had entered leaked outside while maintaining contact with the rotating part or fixed wall in the casing. . When adhering to the rotating part, it can be pushed back into the casing by the rotating centrifugal force, but there is no means for mechanically preventing oil leaking outside through the fixed wall.

  The present invention has been made based on the above-mentioned verification by the inventors for the purpose of improving the allowable limit of leakage of lubricating oil even when a certain amount or more of lubricating oil has entered from the inside of the casing. is there.

The present invention
A gear device for a railway vehicle in which a small gear formed on a small gear shaft connected to an electric motor via a shaft coupling and a large gear attached to an axle are meshed and accommodated in a casing.
A bearing lid at a portion where the small gear shaft and / or the axle each protrudes through the casing, or a fixed sleeve or the casing provided between the bearing lid and the casing;
A rotating sleeve mounted between the bearing lid and a bearing that rotatably supports the small gear shaft and / or the axle of the small gear shaft and / or the axle;
A non-contact type sealing device provided with a labyrinth channel and / or a slinger on each opposing surface,
The main feature is that an oil repellent treatment is applied to the inner surface of the bearing lid and / or the fixing sleeve and / or the casing located on the outer peripheral side of the slinger and / or the labyrinth flow path.

  In the present invention, since the inner surface of the bearing lid and / or the fixing sleeve and / or the casing located on the outer peripheral side of the slinger and / or labyrinth flow path is subjected to the oil repellent treatment, the lubricating oil adhering to the inner surface Peeling is promoted. Therefore, as a result, the contact with the air flow generated by the rotation of the rotating part forming the slinger and / or labyrinth flow path and the rotating surface is promoted, so that the action of returning the lubricating oil to the inside of the casing is improved.

  In the present invention, when the surface of the rotating part forming the slinger and / or labyrinth channel is subjected to an oleophilic treatment, the contact of the lubricating oil to the surface of the rotating part is promoted, and as a result, by the rotational centrifugal force, The effect | action which returns lubricating oil to the inside of a casing improves.

  In this invention, since the effect | action which returns lubricating oil to the inside of a casing improves, the tolerance limit of the leakage of lubricating oil is improved and the sealing performance of a non-contact-type sealing device improves.

It is sectional drawing of the principal part of the non-contact-type sealing device in the gear apparatus for railway vehicles of this invention. It is a figure explaining oil repellency and lipophilicity. It is the figure which showed the locus | trajectory of the flow of the oil particle in the non-contact-type sealing device of the structure shown in FIG. 1 which does not have the characteristic of this invention by multiphase flow numerical analysis. It is sectional drawing of the gear apparatus for railway vehicles of an oil bath lubrication type. It is a figure explaining the non-contact-type sealing device which provided the multistage labyrinth flow path. It is a figure explaining the non-contact-type sealing device provided with the slinger. It is sectional drawing of the principal part of the non-contact-type sealing apparatus in the conventional gear apparatus for rail vehicles.

  The object of the present invention is to further improve the sealing performance of a non-contact type sealing device in a railway vehicle gear device, for example, by applying an oil repellent treatment to the inner surface of a casing located on the outer peripheral side of the slinger.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of a main part of a non-contact type sealing device in a railway vehicle gear device according to the present invention, FIG. 2 is a diagram for explaining oil repellency and lipophilicity, and FIG. 3 is a characteristic of the present invention by multiphase flow numerical analysis. It is the figure which showed the locus | trajectory of the flow of the oil particle in the non-contact-type sealing device of the structure shown in FIG. 1 and 3, the same reference numerals as those in FIGS. 4 to 7 denote the same or corresponding parts, and a detailed description thereof will be omitted.

  As shown in FIG. 1, for example, the non-contact type sealing device for a railway vehicle gear device according to the present invention includes a casing 6 and a rotating sleeve 13 from the bearing side to a region extending from the bearing of the axle 5 to the outside of the casing 6. A narrow gap 14, a large space 15, and a narrow gap 16 are formed in this order. Further, the rotary sleeve 13 and the bearing lid 12 form a small space 17, a labyrinth channel 10, and a narrow gap 18 in this order. A slinger 11 is provided on the rotating sleeve 13 located in the large space 15.

  In the non-contact type sealing device having the above-described configuration, for example, the inner surface of the large space 15 (casing 6) located on the outer peripheral side of the slinger 11 is subjected to oil repellency treatment, while the surface of the slinger 11 is large. It is characterized in that the surface of the rotating sleeve 13 located in the space 15 is subjected to a lipophilic treatment. In FIG. 1, 21 indicates a surface subjected to oil repellent treatment, and 22 indicates a surface subjected to lipophilic treatment.

  The oil repellency and oleophilicity referred to in the present invention are defined by the contact angle θ between the metal surface 19 such as a casing and the lubricating oil 7 adhering to the metal surface 19 as shown in FIG.

  Specifically, the contact angle of the lubricating oil 7 dropped on the metal surface 19 subjected to the surface treatment is larger than the contact angle θ (the center of the paper surface in FIG. 2) of the lubricating oil 7 dropped on the metal surface 19 not subjected to the surface treatment. If θ is large, it means that it has oil repellency (right side of FIG. 2).

  On the other hand, the contact angle θ of the lubricant 7 dropped on the metal surface 19 subjected to the surface treatment should be smaller than the contact angle θ of the lubricant 7 dropped on the metal surface 19 not subjected to the surface treatment (center of the paper surface in FIG. 2). This means that it has lipophilicity (left side in FIG. 2).

  In the case of the non-contact sealing device having the above configuration, when a large amount of lubricating oil 7 enters the large space 15 from the bearing side through the narrow gap 14, the surface of the slinger 11 and the rotating sleeve 13, the casing 6 forming the large space 15 is formed. Lubricating oil 7 adheres to the inner surface.

  At this time, in the present invention, since the oil repellent treatment is applied to the inner surface of the casing 6 that forms the large space 15, peeling of the lubricating oil 7 adhering to the inner surface of the casing 6 from the inner surface of the casing 6 is promoted.

  As a result, the action of returning the lubricating oil 7 peeled off from the inner surface of the casing 6 to the inside of the casing 6 by the air flow generated by the rotation of the slinger 11 and the rotating sleeve 13 is improved.

  Further, by applying a lipophilic treatment to the surfaces of the slinger 11 and the rotating sleeve 13, adhesion of the lubricating oil 7 to the surfaces of the slinger 11 and the rotating sleeve 13 is promoted. In addition, the action of returning the lubricating oil 7 adhering to the surface of the rotating sleeve 13 to the inside of the casing 7 is improved.

  In order to confirm the inventive step of the present invention over the prior art, the inventors conducted multiphase flow numerical analysis and bench rotation test.

  Multiphase flow numerical analysis was performed using Fluent, which is one of general-purpose CFD (computational fluid dynamics).

  Specifically, the non-contact seal structure shown in FIG. 7 that does not perform oil repellency treatment on the inner surface of the casing 6 positioned on the outer peripheral side of the slinger 11 and oleophilic treatment on the surface of the slinger 11 is an axially symmetric three-dimensional structure. Expressed by a calculation model, a moving wall boundary condition is set on the outer peripheral surface of the rotating sleeve 13, and a stationary wall boundary condition is set on the inner surface of the casing 6.

  Then, by setting a boundary condition that makes a difference between the air pressure near the inlet and the outlet of the labyrinth channel 10, air and oil droplets flow out from the bearing portion through the labyrinth channel 10 to the outside. Induced. As a fluid model, the VOF (Volume of Fluid) method, which can accurately calculate the two-phase flow state of gas and liquid, was used.

  FIG. 3 shows the result of the multiphase flow numerical analysis for the non-contact sealing device shown in FIG. 7 in which the oil repellent treatment to the inner surface of the casing 6 positioned on the outer peripheral side of the slinger 11 and the lipophilic treatment to the surface of the slinger 11 are not performed. Shown in

  In FIG. 3, oil droplets 7 a leaking through the narrow space 14 along the inner surface of the large space 15 (casing 6), or being swung off by the rotational centrifugal force and captured by the inner surface of the large space 15 (casing 6). The oil droplet 7b etc. which contacted the slinger 11 are clearly caught. A return hole that communicates with the interior of the casing 6 is provided in the lower portion of the large space 15 so that oil can be returned to the interior of the casing 6 by gravity.

  Based on the result of FIG. 3, the non-contact seal device of the present invention having the non-contact seal structure shown in FIG. 1 and having the oil repellent treatment applied to the inner surface of the casing 6 positioned on the outer peripheral side of the slinger 11, A gear device incorporating the non-contact sealing device of the present invention whose surface was also treated with an oleophilic material was prototyped, and whether or not the lubricating oil 7 leaked was determined by a bench rotation test.

  The gear unit casing used in this bench rotation test was for the Shinkansen, and in order to promote oil leakage, a larger amount of lubricating oil than the rating was enclosed. Super Galaco (trade name) manufactured by Soft99 Corporation is used as the oil repellent surface treatment agent, and the hydrophilic functional coating agent HFC-P01 / H-240M manufactured by Harima Chemical Co., Ltd. is used as the surface treatment agent for lipophilicity. did.

  The results of the bench rotation test are shown in Table 1 below. As shown in Table 1 below, the non-contact sealing device of the present invention in which the inner surface of the casing 6 positioned on the outer peripheral side of the slinger 11 is subjected to oil repellency treatment, or the book in which the surface of the slinger 11 is also subjected to lipophilic treatment In the non-contact sealing device of the invention, it can be seen that no lubricating oil leaks.

  That is, in this invention, since the effect | action which returns the oil droplet 7a adhering to the inner surface of the large space 15 (casing 6) and the oil droplet 7b which contacted the slinger 11 to the inside of the casing 6 improves, a non-contact-type sealing device of Sealing performance is improved.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the above example, the non-contact sealing device of the present invention is applied to a portion where the axle 5 protrudes through the casing 6, but the portion where the small gear shaft 2 protrudes through the casing 6 is applied. You may apply.

  In the above example, the labyrinth flow path 10 is formed by the bearing lid 12 and the rotating sleeve 13, but a fixed sleeve is interposed between the bearing lid 12 and the casing 6, and the labyrinth is formed by the fixed sleeve and the rotating sleeve 13. The flow path 10 may be formed.

  In addition to or in place of the above example, the surface of the rotating sleeve 13 forming the labyrinth channel 10 is subjected to a lipophilic treatment, or the bearing lid 12 positioned on the outer peripheral side of the labyrinth channel 10. Alternatively, an oil repellent treatment may be applied to the inner surface of the fixed sleeve.

  The present invention described above can be applied to any gear device, not limited to a gear device for a railway vehicle.

DESCRIPTION OF SYMBOLS 1 Gear apparatus 2 Small gear shaft 5 Axle 6 Casing 7 Lubricating oil 8,9 Bearing 10 Labyrinth flow path 11 Slinger 12 Bearing lid 13 Rotating sleeve 21 Oil-repellent surface 22 Surface subjected to lipophilic treatment

Claims (6)

A non-contact type sealing device for a railway vehicle gear device provided at a protruding portion protruding outside from a bearing of a rotating shaft penetrating a casing,
A bearing lid fixed to the casing in the axial direction of the rotary shaft;
The bearing lid is positioned on the outer side of the labyrinth flow path portion that forms a non-rotating portion of the labyrinth flow path that prevents the lubricating oil supplied to the bearing from leaking to the outside. A small space part that forms a space,
A non-contact type sealing device for a railway vehicle gear device , wherein an oil repellent treatment is performed on at least a part of an inner surface forming the small space portion . A non-contact type sealing device for a railway vehicle gear device provided at a protruding portion protruding outside from a bearing of a rotating shaft penetrating a casing,
The casing includes a large space portion that forms a large space in which a slinger provided on the rotating shaft is disposed,
Wherein among the inner surface defining a large space portion, at least in part on the non-contact type sealing device of railway vehicle gearing you characterized in that oil repellent treatment is applied. A bearing lid fixed to the casing in the axial direction of the rotary shaft;
The bearing lid is located on the outer side of the labyrinth flow path portion that forms a non-rotating portion of the labyrinth flow path that prevents the lubricating oil supplied to the bearing from leaking to the outside. A small space part that forms a space,
3. The non-contact type sealing device for a railway vehicle gear device according to claim 2, wherein at least a part of an inner surface forming the small space portion and the large space portion is subjected to an oil repellency treatment. 4. . A non-contact type sealing device for a railway vehicle gear device provided at a protruding portion protruding outside from a bearing of a rotating shaft penetrating a casing,
A bearing lid fixed to the casing in the axial direction of the rotating shaft;
A fixing sleeve interposed between the casing and the bearing lid in the axial direction of the rotary shaft;
The fixed sleeve includes a labyrinth passage portion that forms a non-rotating portion of the labyrinth passage that prevents the lubricant supplied to the bearing from leaking to the outside, and an outer peripheral portion that is located on the outer peripheral side of the labyrinth passage portion And comprising
A non-contact type sealing device for a gear device for a railway vehicle, wherein an oil repellent treatment is applied to at least a part of an inner surface forming the outer peripheral portion. The casing includes a large space portion that forms a large space in which a slinger provided on the rotating shaft is disposed,
5. The non-contact type sealing device for a railway vehicle gear device according to claim 4, wherein at least a part of an inner surface forming the outer peripheral portion and the large space portion is subjected to an oil repellency treatment. 6. The railway vehicle gear device according to claim 1, wherein at least a part of a surface of the rotating portion of the non-contact sealing device is subjected to lipophilic treatment. Non-contact seal device.