JP6563698B2 - Railway vehicle gear system - Google Patents

Description

  The present invention relates to a gear device for a railway vehicle that includes a gear box that houses a gear coupled to an axle of the railway vehicle, and a breather that is attached to an upper surface of a mounting seat provided on the upper portion of the gear box.

  This type of railway vehicle gear device is known from Patent Document 1, for example. In this case, the breather includes a breather body having a breather passage that communicates with a passage formed in the gear box and ventilates the inside and outside of the gear box. Further, it has been conventionally known that a breather body is provided with a valve mechanism that cuts off the communication between the breather passage and the passage when the external air pressure is relatively lower than the internal pressure of the gear box and exceeds an allowable range. (For example, refer to Patent Document 2).

  Here, for example, rotation of the gear within the gear box may cause the internal pressure of the gear box to be relatively lower than the external air pressure, and in this case, a suction force toward the inside of the gear box acts on the breather passage. In each of the above conventional examples, since the vent at the outer end of the breather passage is exposed, if a suction force toward the gear box acts, not only the outside air but also the weather conditions (snowfall and rain) Depending on the time, rainwater etc. is also sucked. Also, because the gearbox is hot during railway vehicle operation, if snow adheres to the breather or mounting seat, it may melt and remain as water droplets on the top surface of the mounting seat. However, when a suction force toward the gear box is applied, water droplets are sucked. When the sucked water molecules are mixed into the lubricating oil stored in the gear box, the lubricating oil is emulsified, resulting in a problem that the lubricating performance of the lubricating oil is deteriorated.

JP 2011-122641 A JP 2012-36941 A

  In view of the above points, the present invention has a simple structure that allows water into the gear box even when the internal pressure of the gear box is relatively lower than the external air pressure and a suction force toward the gear box acts on the breather passage. An object of the present invention is to provide a railway vehicle gear device that can suppress the sucking of molecules as much as possible.

In order to solve the above-described problems, a railway vehicle gear according to the present invention, comprising: a gear box that houses a gear coupled to an axle of a railway vehicle; and a breather that is attached to an upper surface of a mounting seat provided at an upper portion of the gear box. The device has a breather passage through which the breather communicates with the passage formed in the gear box and vents the inside and outside of the gear box. The breather covers from above and around the breather, and the lower end extends below the upper surface of the mounting seat. a cover member defining a vent gap around the mounting seat is wider than the ventilation air space is formed inside of the cover body located above the mounting seat, vent gap through this space communicates with the breather passage It is characterized by that.

  According to the present invention, since the lower end of the cover body extends downward beyond the upper surface of the mounting seat, it is possible to eliminate a portion where water droplets remain in the vicinity of the vent at the outer end of the breather passage. In addition, since the breather passage is communicated with the breather passage through a space wider than the ventilation gap, the suction force generated in the ventilation gap when the internal pressure of the gear box is relatively lower than the external pressure is reduced by the ventilation at the outer end of the breather passage. Even if water molecules such as outside air and rainwater are sucked from the ventilation gap, the speed will drop rapidly when it reaches the space from the ventilation gap. The amount of water molecules reaching the vent at the outer end of the breather passage is reduced. As a result, the inhalation of water molecules into the gear box can be suppressed as much as possible, and the occurrence of problems such as deterioration of the lubricating performance of the lubricating oil stored in the gear box can be prevented.

  In the present invention, the breather includes a breather body that is seated on the upper surface of the mounting seat, and a recess portion that is recessed in the upper surface of the breather body, and a recess portion that rises upward from a vent formed in the outer end of the breather passage. The breather passage is configured by a first passage portion communicating with the second passage portion and a second passage portion extending in the up-down direction and communicating with the passage of the gear box, and covers the lid body covering the depression portion from above It is preferable that the body is also used. According to this, it is possible to suppress the suction of water molecules into the gear box as much as possible with a simple structure having a small number of parts.

The front view which shows the gear box of the gear apparatus for railway vehicles of this invention. (a) is a figure which expands and shows the part of the gear box to which the breather was attached, (b) is sectional drawing which follows the II (b) -II (b) line | wire in FIG. 2 (a), (c) ) Is a plan view of the breather shown with the cover body removed. Sectional drawing of the breather which concerns on a modification. Sectional drawing of the breather which concerns on another modification. Sectional drawing of the breather which concerns on another modification.

  Hereinafter, a railway vehicle gear device according to an embodiment of the present invention will be described with reference to the drawings. In the following, the gearbox is assumed to be provided under the floor of the railway vehicle in the posture shown in FIG. 1, and words indicating directions such as “up”, “down”, “left”, and “right” are used based on this. And

1 and 2, reference numeral 1 denotes a gear box of a railway vehicle gear device. Although not shown in detail, the gear box 1 houses a small gear fixed to an input shaft and a large gear 11 fixed to an axle connected to a driving source such as a motor that meshes with each other. The lower part is immersed in the lubricating oil 12. In addition, since a well-known thing can be utilized for the gear apparatus itself, the further description is abbreviate | omitted. A mounting seat 13 is integrally provided at a predetermined position above the gear box 1 so as to protrude upward. The top wall of the gear box 1, the after extending from the inner space 14 in the lateral direction, the passage 15 opening into the upper surface 13a of the mounting seat 13 rises the mounting seat 13 upward is formed. A breather Bz is provided on the upper surface 13 a of the mounting seat 13 via a sealing material 16. Hereinafter, the form of the breather Bz will be described.

  As shown in FIGS. 2 (a) to 2 (c), the breather Bz is provided at the outer end of the passage 15 and a rectangular parallelepiped breather body 2 having a base plate portion 2a seated on the upper surface 13a of the mounting seat 13. A valve mechanism 3 is provided that shuts off the communication between the passage 15 and the breather passage 23 when the atmospheric pressure is relatively lower than the internal pressure of the gear box 1 (the pressure of the internal space 14). The upper surface of the breather body 2 is provided with a recessed portion 21, and vent holes 22 are formed on the respective side surfaces so as to be located at a predetermined height from the upper surface 13 a. Further, in the breather body 2, a first passage portion 23 a is formed which extends in the left-right direction from the respective vent holes 22 and then rises upward to communicate with the recess portion 21. A second passage portion 23b that extends in the vertical direction on the inside and communicates the hollow portion 21 and the passage 15 is formed, and the first passage portion 23a and the second passage portion 23b constitute a breather passage 23. The hollow portion 21 is covered with a lid from above and its internal space is kept airtight. The second passage portion 23b is filled with a filter F1 that mainly serves to remove the mist component of the lubricating oil 12. The filter F1 can be appropriately selected from known materials such as cloth and porous synthetic resin.

  The valve mechanism 3 includes a valve body 31 including a shaft portion 31 a that is inserted with a gap between the valve 15 and a flange portion 31 b that can be seated on the upper surface 13 a of the mounting seat 13. A plurality of ventilation grooves 31c extending in the radial direction from the shaft portion 31a are formed on the lower surface of the flange portion 31b. As shown in FIG. 2B, when the pressure inside and outside the gear box 1, that is, when the pressure in the internal space 14 and the outside air is equal, the valve mechanism 3 is opened. That is, the valve body 31 is lowered by its own weight. In this state, the lower surface of the flange portion 31b is seated on the upper surface 13a of the mounting seat 13, and a gap 24 between the upper surface of the flange portion 31b and the lower surface of the breather body 2 is formed. The passage 15 and the second passage portion 23a of the breather passage 23 communicate with each other (the inside and outside of the gear box 1 are vented). On the other hand, when the external pressure of the gear box 1 is lower than the internal pressure, a suction force toward the outside of the gear box 1 acts on the passage 15 and the breather passage 23. At this time, when an upward force exceeding its own weight acts on the valve body 31, the valve body 31 is lifted. And if the upper surface of the flange part 31b closely_contact | adheres to the lower surface of the breather main body 2, communication with the channel | path 15 and the breather channel | path 23 will be interrupted | blocked, and the valve mechanism 3 will be in a valve closing state. Thereby, the pressure release from the gear box 1 is prevented. As a result, coupled with the provision of the filter F1, the mist component of the lubricating oil 12 in the gearbox 1 is prevented from leaking out of the gearbox 1 through the breather passage 23.

  Here, for example, the rotation of the large gear 11 in the gear box 1 may cause the pressure in the internal space 14 of the gear box 1 to be relatively lower than the external air pressure. In this case, the passage 15 and the breather passage 23 may be reduced. A suction force toward the internal space 14 of the gear box 1 acts on the gear box 1. At this time, when water molecules in the outside air are sucked into the passage 15 and the breather passage 23 and mixed into the lubricating oil 12 in the internal space 14, the lubricating oil 12 is emulsified, and as a result, the lubricating performance of the lubricating oil 12 deteriorates. For this reason, it is necessary to comprise so that inhalation of the water molecule in the gear box 1 can be suppressed as much as possible.

  In this embodiment, the cover body 4 that covers the breather body 2 from above and around is provided. The cover body 4 includes a flat plate portion 41 that serves as a lid that covers the hollow portion 21 from above, and a cylindrical portion 42 that is suspended from the lower surface of the flat plate portion 41, and the breather main body via the flat plate portion 41. 2 is screwed to the upper surface. The lower end of the cylindrical portion 42 extends downward beyond the upper surface 13 a of the mounting seat 13 so as to define a ventilation gap 43 around the mounting seat 13. As a result, a space 44 wider than the ventilation gap 43 is formed inside the cover body 4 positioned above the mounting seat 13, and communicates with the vent 22 at the outer end of the breather passage 23 narrower than the space 44 via the space 44. doing. In addition, each first passage portion 23a that rises upward is filled with another filter F2 that mainly serves to remove water molecules. As the other filter F2, it can select suitably from well-known things, such as the product made from a water-absorbing cloth, and the product made from a porous synthetic resin, You may use the same thing or a different material from the filter F1. Moreover, the filling position of the other filter F2 with respect to each 1st channel | path part 23a will not have a restriction | limiting in particular if it is an area | region which excludes both ends in the up-down direction among the parts of each 1st channel | path part 23a which stands | starts up.

  According to the above, since the lower end of the cylindrical portion 42 extends downward beyond the upper surface 13 a of the mounting seat 13, it is possible to eliminate a portion where water droplets remain in the vicinity of the vent hole 22. In addition, the configuration is such that the vent hole 22 narrower than the space 44 communicates with the vent hole 22 narrower than the space 44 through the space 44 wider than the vent gap 43, so that the air can be vented when the pressure in the internal space 14 of the gear box 1 is relatively lower than the external air pressure. The suction force generated in the gap 43 is weaker than that acting on the vent 22, and even if water molecules such as outside air and rainwater are sucked from the vent gap 43, the vent gap 43 enters the space 44. When the speed is reached, the speed is suddenly reduced, so that the amount of water molecules reaching the vent 22 at the outer end of the breather passage 23 is reduced.

  On the other hand, since each first passage portion 23a is filled with another filter F2, water molecules are removed (absorbed) by the filter F2 even if water molecules are sucked from the vent hole 22. Even when the absorption of water molecules in the filter F2 is saturated, the water molecules (water droplets) are only dropped by their own weight, so that the water molecules are not sucked into the gear box 1. As described above, in the present embodiment, the provision of the cover body 4 and the provision of the filter F2 in the first passage 23a together suppress the suction of water molecules into the gear box 1 as much as possible. Therefore, it is possible to prevent the occurrence of problems such as deterioration of the lubricating performance of the lubricating oil 12. And since the cover body which covers the hollow part 21 is shared by the cover body 4, it can be made a simple structure with few components.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the above thing, It can implement with a various form. For example, the filter F2 can be omitted. Moreover, in the said embodiment, the air vent 22 of the breather channel | path 23 outer end was opened in each side surface of the breather main body 2, ie, the air vent 22 was provided so that it might open in the left-right direction along the upper surface 13a of the attachment seat 13. Although the case has been described as an example, the present invention is not limited to this. As shown in FIG. 3, in the breather Bz ₁ according to the modified example, an annular recess 211 that is recessed inward in the radial direction is formed in the lower part of the breather body 20, and the opening is directed toward the annular recess 211. The vent 212 at the outer end of the breather passage 23 may be formed so as to open downward. According to this, when the water molecule absorbed by the other filter F2 falls by its own weight, the water molecule may be discharged to the outside.

Moreover, in the said embodiment, although the lower end of the cylindrical part 42 of the cover body 4 extended to the downward direction exceeding the upper surface 13a of the attachment seat 13, it demonstrated to an example, but it is not limited to this. When there is enough space when the railway vehicle gear device of the present invention is attached to the railway vehicle, and the height of the breather body 220 can be increased as shown in FIG. 4, in other words, the upper surface of the attachment seat 13. When a suction force directed toward the outside of the gear box 1 is applied to a height distance h from 13a to the vent 221 formed on the side surface of the breather body 220, water droplets existing on the upper surface 13a of the mounting seat 13 are sucked from the vent 221. In the case of the breather Bz _{2 according} to another modification, the lower end 401 of the cover body 40 extends downward beyond the vent hole 221 to define a ventilation gap 402 around the breather main body 220. A space 403 wider than the ventilation gap 402 is formed inside the cover body 40 located between the lower end 401 of the cover body 40 and the vent hole 221. Thereby, similarly to the above, the amount of water molecules reaching the vent 221 at the outer end of the breather passage 23 can be reduced.

Furthermore, in the said embodiment, although the cover body 4 was demonstrated to the example which comprised the flat plate part 41 and the cylindrical part 42, it is not limited to this, Still another modification example shown in FIG. In the breather Bz ₃ , a tray part 430 is provided around the breather main body 230 so as to face the cylindrical part 420 of the cover body 400 and with a space in the vertical direction, and between the cylindrical part 420 and the tray part 430. The air is communicated with the outside air through a ventilation gap 440 therebetween. Thereby, even when a water droplet exists on the upper surface 13a of the mounting seat 13, the water droplet is not sucked from the vent 231.

1 ... gearbox railway vehicle gearing, 13 ... mounting seat, 13a ... mounting seat of the upper surface, Bz, BZ 1, _Bz 2, Bz 3 _... breather, 2 ... breather body, 21 ... recess, 22 ... breather passage outside End vent, 23 ... breather passage, 23a ... first passage portion (breather passage), 23b ... second passage portion (breather passage), 4 ... cover body, 43 ... ventilation gap, 44 ... internal space of the cover body, F1, F2 ... filters.

Claims (2)

A gear device for a railway vehicle comprising a gear box that houses a gear connected to an axle of a railway vehicle, and a breather that is attached to an upper surface of a mounting seat provided at an upper portion of the gear box, the breather being formed in the gear box Having a breather passage communicating with the passage and venting the inside and outside of the gear box,
A cover body that covers from above and around the breather, has a lower end that extends beyond the upper surface of the mounting seat and extends downward, defines a ventilation gap around the mounting seat, and vents the interior of the cover body located above the mounting seat. A railway vehicle gear device, wherein a space wider than the gap is formed, and the ventilation gap communicates with the breather passage through the space.   The breather includes a breather body that is seated on the upper surface of the mounting seat, and a recess portion that is recessed in the upper surface of the breather body, and a vent portion that rises upward from a vent formed in the outer end of the breather passage and communicates with the recess portion. The breather passage is constituted by one passage portion and a second passage portion that extends in the vertical direction and communicates the depression portion and the passage of the gear box, and the cover body that covers the depression portion from above is also used as the cover body. The railway vehicle gear device according to claim 1.

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