JP2022064021A - Gear device for railway vehicle - Google Patents

Abstract

To suppress the leakage of a low-viscosity lubricant accompanied by a rise of a temperature supplied to a first bearing device 9a caused by the rotation of a large gear to the outside of a gear box 3 from a bearing lid 11, in a bearing box device 1 for a railway vehicle in which a first bearing box 10a into which a first bearing 9a for pivoting a gear shaft 41 of a small gear 4 is fit is attached to a first sidewall 31 of the gear box 3, the bearing lid 11 surrounding the gear shaft 41 is attached to a side end part of the first bearing box 10a, oil strainer members 12a, 12b constituting a labyrinth seal are arranged in the bearing lid 11, an oil guide hole 13 for guiding a lubricant leaked from the labyrinth seal to the first bearing box 10a side is formed at a lower part of the bearing lid 11, a first return hole 14 reaching an inner face is formed at the first sidewall 31, and a thorough-hole 15 for connecting the oil guide hole 13 and the first return hole 14 is formed at a lower part of the first bearing box 10a.SOLUTION: A second return hole 16 communicating a through-hole 15, and reaching an internal space IS of a gear box 2 is formed at a lower part of a first bearing box 10a.SELECTED DRAWING: Figure 2

Description

The present invention is provided with a gear box, and the small gear connected to the output shaft of the drive source and the large gear connected to the axle are housed in the gear box in a state of being meshed horizontally with each other, and are housed in the gear box. The present invention relates to a gear device for a railroad vehicle having an oil sump at the lower part.

Conventionally, as this type of gear device for railway vehicles, the direction from the small gear to the drive source is one in the axial direction, the opposite side is the other in the axial direction, and the small gear is placed on the first side wall of the gear box on one side in the axial direction. A first bearing box into which a first bearing that supports one side of the gear shaft in the axial direction is fitted is mounted, and the other end in the axial direction of the gear shaft is mounted on the second side wall of the gear box on the other side in the axial direction. A second bearing box into which the second bearing that supports the portion is internally fitted is mounted, and a gear shaft that protrudes from the first bearing box in one axial direction at the side end portion of the first bearing box on one axial direction. It is known that a bearing lid that surrounds the portion is attached, and a tubular oil draining member that is externally fitted to the gear shaft and forms a labyrinth seal with the gear shaft is provided inside the bearing lid (for example,). , See Patent Document 1).

Further, in a gear device for a railroad vehicle, generally, an oil guide hole for guiding lubricating oil leaking from the labyrinth seal in one axial direction to the first bearing box side is provided in the lower part of the bearing lid, and the first side wall of the gear box is provided. A first return hole reaching the inner surface of the first side wall is formed in a portion in contact with the lower part of the outer peripheral surface of the first bearing box, and an oil guide hole and a first oil guide hole for the bearing lid are formed in the lower part of the first bearing box. A through hole is formed to connect with the first return hole of the side wall.

In such a gear device for railway vehicles, as the large gear rotates, it is scraped up from the oil sump to the meshing portion of the small gear and the large gear and supplied to the first bearing, and lubrication leaks from the labyrinth seal in one axial direction. Oil is collected in the oil sump of the gear box through the oil guide hole, the through hole and the first return hole.

Here, the viscosity of the lubricating oil supplied to and lubricated to the first bearing decreases because the temperature rises. In addition, the amount of lubricating oil supplied to the first bearing during high-speed rotation becomes large. As a result, all of the low-viscosity lubricating oil that leaks in one axial direction from the labyrinth seal supplied to the first bearing is collected in the oil sump of the gearbox through the oil guide hole, the through hole and the first return hole. It is difficult, and there is a concern that some of them may leak out of the gear box from the oil guide holes in the bearing lid.

Japanese Unexamined Patent Publication No. 2019-219051

In view of the above points, the present invention can prevent the lubricating oil supplied to the first bearing and whose viscosity decreases as the temperature rises from leaking out of the gear box from the bearing lid. The challenge is to provide the equipment.

In order to solve the above problems, the present invention is provided with a gear box, and the inside of the gear box is provided with a small gear connected to the output shaft of the drive source and a large gear connected to the axle in a state of being meshed horizontally with each other. A gear device for railway vehicles that is housed in a gear box and has an oil reservoir at the bottom of the gear box. On the first side wall of the gear box on the side, a first bearing box in which a first bearing that internally supports a portion of the gear shaft on one side in the axial direction of the small gear is fitted is mounted, and the gear box on the other side in the axial direction is mounted. A second bearing box in which a second bearing that pivotally supports the other end of the gear shaft in the axial direction is fitted is mounted on the second side wall, and a second bearing box is mounted on one side end of the first bearing box in the axial direction. 1 A bearing lid is attached to surround the part of the gear shaft that protrudes in one axial direction from the bearing box, and the tubular oil that fits outside the gear shaft and forms a labyrinth seal with the gear shaft inside the gear lid. A cutting member is provided, and an oil guide hole for guiding lubricating oil leaking from the labyrinth seal in one axial direction to the first bearing box side is provided at the lower part of the gear box, and the first side wall of the gear box is provided with the first bearing. A first return hole reaching the inner surface of the first side wall is formed in a portion in contact with the lower part of the outer peripheral surface of the box, and an oil guide hole of the bearing lid and a first return hole of the first side wall are formed in the lower part of the first bearing box. The first bearing box is used to collect the lubricating oil that leaks from the labyrinth seal in one axial direction through the oil guide hole, the through hole, and the first return hole to the oil sump of the gear box. A second return hole is formed at the lower part of the gear box, which communicates with the through hole and reaches the internal space of the gear box.

According to the present invention, the lubricating oil that leaks from the labyrinth seal in one axial direction and is guided to the oil guide hole can be recovered to the oil sump portion of the gear box through the through hole and the second return hole. Therefore, even if a large amount of lubricating oil is supplied to the first bearing, the lubricating oil can be recovered in the oil sump portion by two routes leading to the first return hole and the second return hole, so that the lubricating oil can be recovered. The amount of recovery is large, and it is possible to prevent the lubricating oil from leaking from the bearing lid to the outside of the first bearing box.

The side view which shows one Embodiment of the gear device for a railroad vehicle of this invention. (A) is a sectional view taken along the line AA of the gear device for a railway vehicle shown in FIG. (B) is a sectional view taken along the line BB of the gear device for a railway vehicle shown in FIG.

An embodiment of the gear system for a railroad vehicle of the present invention will be described with reference to FIGS. 1 and 2 (a) and 2 (b). The railroad vehicle gear device 1 is fixed under the floor of the railroad vehicle by the suspension device 2. The gear device 1 for a railroad vehicle includes a gear box 3. In the gearbox 3, the small gear 4 connected to the output shaft of a drive source (not shown) and the large gear 5 connected to the axle are housed in the gearbox 3 in a state of being horizontally meshed with each other. There is. A lid 6 covering the upper part of the small gear 4 and the large gear 5 is fastened to the opening on the upper surface of the gear box 3 (omitted in FIGS. 2A and 2B).

An oil sump portion 7 is provided at the lower portion of the gear box 3. The oil sump portion 7 has a first oil sump portion 71 in which the lubricating oil L is stored and the lower portion of the large gear 5 is immersed in the lubricating oil L, and a second oil sump portion 72 located below the small gear 4. Have. The first oil sump portion 71 and the second oil sump portion 72 are partitioned by a partition wall 8 provided at the lower part of the gear box 3, and a communication hole 81 is formed in the partition wall 8 to form a first oil sump portion. The 71 and the second oil reservoir 72 are communicated with each other by a communication hole 81.

Further, in the gear box 3, the small gear is on the first side wall 31 of the gear box 3 on one side in the axial direction, with the direction from the small gear 4 toward the drive source (not shown) being one axial direction and the opposite side being the other axial direction. A first bearing box 10a into which a first bearing 9a that pivotally supports a portion 41a on one side of the gear shaft 41 in the axial direction of 4 is fitted is mounted. Further, a second bearing box 10b into which a second bearing 9b that pivotally supports the other end portion 41b of the gear shaft 41 in the axial direction is fitted is mounted on the second side wall 32 of the gear box 3 on the other side in the axial direction. ing. The first side wall 31 and the second side wall 32 of the gear box 3 are formed with openings for mounting the first bearing box 10a and the second bearing box 10b, respectively, and the first bearing box 10a and the first bearing box 10a and the first bearing box 10a are formed in these openings, respectively. 2 The bearing box 10b is fitted inside. The flange 10a ₁ extends on the outer periphery of the side end portion on one side in the axial direction of the first bearing box 10a. The first bearing 9a is a roller bearing, and the outer ring thereof is fitted inside the first bearing box 10a, and the inner ring is fitted outside the portion 41a on one side in the axial direction of the gear shaft 41. The second bearing 9b is configured such that a roller bearing located on one side in the axial direction and a ball bearing located on the other side in the axial direction are adjacent to each other and arranged side by side. The flange 10b ₁ extends on the outer periphery of the side end portion on the other side in the axial direction of the second bearing 9b.

Further, in the gear box 3, a bearing lid 11 is attached to a side end portion of the first bearing box 10a on one side in the axial direction to surround a portion 41a of the gear shaft 41 projecting from the first bearing box 10a in the axial direction. There is. The bearing lid 11 is composed of an inner lid 111 located on the other side in the axial direction and fastened to the first bearing box 10a, and an outer lid 112 located on one side in the axial direction and fastened to the inner lid 111. There is. On the outer periphery of the portion of the inner lid 111 located on the first bearing box 10a side, a flange 111a that is in close contact with the flange 10a ₁ of the first bearing box 10a extends. When the bearing lid 11 is attached to the side end portion on one side of the first bearing box 10a in the axial direction, the surface on the other side in the axial direction of the flange 111a of the inner lid 111 is in the axial direction of the flange 10a ₁ of the first bearing box 10a. It is overlapped with the surface on one side, and the bolt is screwed into the first side wall 31 of the gear box 3 from one side to the other in the axial direction. In this way, the inner lid 111 is fastened to the side end portion on one side in the axial direction of the first bearing box 10a. This fastening is performed at predetermined intervals in the circumferential direction of the inner lid 111. The outer lid 112 is overlapped with the side end portion on one side in the axial direction of the inner lid 111, and the bolt is screwed into the outer peripheral portion of the inner lid 111 from one side in the axial direction to the other side, whereby the outer lid 112 is formed. It is fastened to the inner lid 111, and the inner lid 111 and the outer lid 112 are integrated as a bearing lid 11. The outer lid 112 is also fastened at predetermined intervals in the circumferential direction of the outer lid 112.

As shown in FIG. 2A, cylindrical oil draining members 12a and 12b that are fitted onto the gear shaft 41 and form a labyrinth seal with the bearing lid 11 are provided inside the bearing lid 11. There is. The oil draining member 12a is provided in the inner lid 111, and the oil draining member 12b is provided in the outer lid 112. Further, an oil guide hole 13 is formed in the lower portion of the bearing lid 11 to guide the lubricating oil L leaking from the labyrinth seal to one side in the axial direction toward the first bearing box 10a. The oil guide hole 13 is located at the lower part of the inner lid 111.

Further, the first side wall 31 of the gear box 3 is formed with a first return hole 14 that reaches the inner surface of the first side wall 31 at a portion in contact with the lower portion of the outer peripheral surface of the first bearing box 10a. Further, a through hole 15 is formed in the lower portion of the first bearing box 10a to connect the oil guide hole 13 of the bearing lid 11 and the first return hole 14 of the first side wall 31. Therefore, in the gear device 1 for railway vehicles, as the large gear 5 rotates, the oil sump portion 7 (first oil sump portion 71) is scraped up by the meshing portion of the small gear 4 and the large gear 5 and the first bearing 9a. The lubricating oil L that is supplied and leaks from the labyrinth seal in one axial direction can be collected in the oil sump portion 7 of the gear box 3 through the oil guide hole 13, the through hole 15, and the first return hole 14. To recover the lubricating oil L to the oil sump portion 7, specifically, the lubricating oil L flowing out of the first return hole 14 is dropped into the second oil sump portion 72, and the lubrication is stored in the second oil sump portion 72. This is achieved by allowing the oil L to flow out to the first oil reservoir 71 through the communication hole 81.

Here, the viscosity of the lubricating oil L supplied to and lubricated to the first bearing 9a decreases because the temperature rises. In addition, the amount of lubricating oil L supplied to the first bearing 9a during high-speed rotation becomes large. As a result, all of the lubricating oil L that is supplied to the first bearing 9a and whose viscosity decreases as the temperature rises and leaks from the labyrinth seal in one axial direction is the oil guide hole 13, the through hole 15, and the first return hole 14. It is difficult to collect the oil in the oil sump portion 7 (first oil sump portion 71) of the gear box 3 through the oil box 3, and there is a concern that a part of the oil may leak out of the gear box 3 from the oil guide hole 13 of the bearing lid 11. ..

Therefore, as shown in FIG. 2B, in the railroad vehicle gear device 1, a second return hole is provided in the lower part of the first bearing box 10a, which communicates with the through hole 15 and reaches the internal space IS of the gear box 3. 16 is formed. The second return hole 16 extends from one axial direction to the other axial direction, and its downstream end is bent downward along the first side wall 31 of the gear box 3. Therefore, the lubricating oil L that leaks from the labyrinth seal in one axial direction and is guided to the oil guide hole 13 can be collected in the oil sump portion 7 of the gear box 3 through the through hole 15 and the second return hole 16. Therefore, even if the amount of lubricating oil L supplied to the first bearing 9a becomes large, the lubricating oil L can be passed through the oil sump portion 7 (first oil sump) through two paths leading to the first return hole 14 and the second return hole 16. Since it can be recovered in the portion 71), the amount of the lubricating oil L recovered is increased, and leakage from the bearing lid 11 to the outside of the gear box 3 is suppressed.

The second bearing box 10b shown in FIGS. 2A and 2B has substantially the same structure as the first bearing box 10a. On the other hand, on the side wall portion on the other side in the axial direction of the second bearing box 10b, a cover 17 having a simplified structure in which the oil draining members 12a and 12b are not provided is fastened to the second bearing box 10b. However, assuming that the lubricating oil L is also slightly supplied to the second bearing 9b, the second bearing box 10b located below the second bearing 9b is provided with the first bearing box 10a. A through hole 15a similar to the formed through hole 15 is formed, and the second side wall 32 has a third return that reaches the inner surface of the second side wall 32 at a portion in contact with the lower part of the outer peripheral surface of the second bearing box 10b. The hole 18 is formed. In this way, the lubricating oil L leaking from the second bearing 9b located on the other side in the axial direction of the second bearing 9b can be discharged to the oil sump portion 7 of the gear box 3 through the through hole 15a and the third return hole 18. It can be collected in the first oil reservoir 71. Therefore, the leakage of the lubricating oil L to the outside of the gear box 3 is further suppressed.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, details such as the structure and structure of the oil sump portion 7, the types of bearings used in the first bearing 9a and the second bearing 9b, the structure and structure of the oil draining members 12a and 12b, and the structure and structure of the bearing lid 11. Can adopt various aspects as long as the problems of the present invention can be solved. Further, the second return hole 16 may be simply a hole having a linear shape extending from one axial direction to the other axial direction. Further, if the through hole 15 extends in the circumferential direction of the first bearing box 10a, the first return hole 14 is provided on the first side wall 31 of the gear box 3 within the length range of the through hole 15. Can be formed. In this case, the recovered amount of the lubricating oil L can be increased.

1 ... Gear device for railway vehicles, 3 ... Gear box, 31 ... 1st side wall, 32 ... 2nd side wall, 4 ... Small gear, 5 ... Large gear, 7 ... Oil reservoir, 9a ... 1st bearing, 9b ... No. 2 bearings, 10a ... 1st bearing box, 10b ... 2nd bearing box, 11 ... bearing lid, 12a, 12b ... oil draining member, 13 ... oil guide hole, 14 ... first return hole, 15 ... through hole, 16 ... Second return hole, L ... Lubricating oil, IS ... Internal space.

Claims (1)

It is equipped with a gearbox, and the small gear connected to the output shaft of the drive source and the large gear connected to the axle are housed in the gearbox in a state where they are meshed horizontally with each other, and an oil pool is stored in the lower part of the gearbox. It is a gear device for railway vehicles provided with a part,
The direction from the small gear to the drive source is one in the axial direction, and the opposite side is the other in the axial direction. A first bearing box into which the first bearing is internally fitted is mounted, and a second bearing that pivotally supports the other end of the gear shaft in the axial direction is internally fitted in the second side wall of the gear box on the other side in the axial direction. The second bearing box is installed.
A bearing lid that surrounds the portion of the gear shaft that protrudes from the first bearing box in one axial direction is attached to the side end of the first bearing box on one side in the axial direction. , A tubular oil draining member that constitutes a labyrinth seal is provided between the bearing lid and the bearing lid.
An oil guide hole is provided in the lower part of the bearing lid to guide the lubricating oil leaking in one axial direction from the labyrinth seal to the first bearing box side, and the first side wall of the gear box is at the lower part of the outer peripheral surface of the first bearing box. A first return hole that reaches the inner surface of the first side wall is formed in the contacting portion, and a through hole that connects the oil guide hole of the bearing lid and the first return hole of the first side wall is formed in the lower part of the first bearing box. Is formed, and the lubricating oil that leaks from the labyrinth seal in one axial direction is collected in the oil sump of the gear box through the oil guide hole, the through hole, and the first return hole.
A gear device for railroad vehicles, characterized in that a second return hole is formed in the lower part of the first bearing box so as to communicate with the through hole and reach the internal space of the gear box.

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