JP2019203525A - Gear device - Google Patents

Abstract

To provide a gear device for a railway vehicle capable of effectively reducing energy loss caused by circulation of a lubricant.SOLUTION: A gear device 1 includes a small gear 2 having a shaft 3 connectable to a power source, a large gear 4 having an axle 5 as a shaft and engaged with the small gear 2, and a gear box 6 in which the small gear 2 and the large gear 4 are accommodated while being arranged in a longitudinal direction, and the lubricant is stored. The gear box 6 includes: right and left side walls 7 disposed on right and left of the small gear 2 and the large gear 4 respectively, and rotatably supporting the shaft 3 of the small gear 2 and the axle 5 of the large gear 4, respectively; a first end wall 8; a second end wall 9; a bottom wall 10; an upper cover 11; and pockets 15 disposed between each of the right and left side walls 7 and the large gear 4, and disposed more on an upper part from the axle 5, respectively. Openings 16 are provided on upper portions of the pockets 15, and holes 17 are provided at lowermost portions of the pockets 15.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gear device for a railway vehicle.

  In a railway vehicle, power from an electric motor is transmitted to an axle, and a wheel integrated with the axle rotates. As a result, the railway vehicle travels on the rail. A gear device is used to transmit power to the axle. The gear device includes a small gear and a large gear that mesh with each other. The shaft of the small gear is connected to the electric motor through a shaft coupling. The shaft of the large gear is the axle. The small gear and the large gear are accommodated in a gear box. The shaft of the small gear and the shaft (axle) of the large gear are rotatably supported on the gear box by bearings.

  Lubricating oil is stored at the bottom of the gear box to such an extent that the lower part of the large gear is immersed. The lubricating oil is splashed up by the rotating large gear. Thereby, the splash of lubricating oil is supplied to the meshing part of the gear and the bearing, and each part is lubricated. The lubricating oil used for lubricating each part finally returns to the bottom of the gear box and is splashed up again by the large gear. In this way, the lubricating oil circulates inside the gear box.

  In recent years, railway vehicles are required to reduce energy loss. Here, the circulation of the lubricating oil utilizes the rotation of the large gear. Therefore, a part of the power (energy) for running the railway vehicle is consumed by circulation of the lubricating oil. Therefore, it can be said that the energy loss can be reduced by reducing the energy consumed in the circulation of the lubricating oil. In order to reduce the energy consumed by the circulation of the lubricating oil, it is effective to reduce the amount of the lubricating oil substantially circulated in the gear box (hereinafter also referred to as “circulated oil amount”). This is mainly because the resistance that the large gear receives from the lubricant can be reduced. However, if the total amount of lubricating oil stored in the gearbox is simply reduced, the supply of lubricating oil to each part (gear meshing part and bearing) at the time of startup becomes insufficient. Therefore, the total amount of lubricating oil needs to be maintained.

  For example, Japanese Unexamined Patent Application Publication No. 2009-180371 (Patent Document 1) discloses a gear device for a railway vehicle including an oil sump inside a gear box. The oil sump is arranged above the large gear side of the small gear. The oil sump includes an opening and a return hole. When the viscosity of the lubricating oil is low, the opening can allow the lubricating oil, which has been lifted to the opposite side of the small gear by the rotation of the large gear, to flow into the sump. Further, the return hole can flow out the lubricating oil flowing into the oil reservoir from the oil reservoir.

  In the gear device disclosed in Patent Document 1, the total amount of lubricating oil is an amount capable of supplying the lubricating oil to the bearing even at a low temperature when the viscosity of the lubricating oil is high. Patent Document 1 describes that a sufficient amount of lubricating oil can be supplied to the bearing because the lubricating oil hardly flows from the oil reservoir opening at the time of start-up or rapid acceleration when the viscosity of the lubricating oil is high. On the other hand, during continuous operation at high speed, the viscosity of the lubricating oil becomes low, so that the lubricating oil that has been lifted up by the large gear flows into the oil sump from the opening. As a result, excess lubricating oil accumulates in the oil sump, and the amount of circulating oil decreases. Therefore, it is described in Patent Document 1 that an increase in stirring heat can be suppressed.

JP 2009-180371 A

  In the gear device disclosed in Patent Document 1, the oil sump is disposed above the large gear side of the small gear. In this case, the capacity of the oil sump is small. That is, the reduction of the circulating oil amount is limited. Therefore, the energy loss due to the circulation of the lubricating oil cannot be effectively reduced.

  The present invention has been made in view of the above circumstances. One object of the present invention is to provide a gear device for a railway vehicle that can effectively reduce energy loss caused by circulation of lubricating oil.

  A gear device for a railway vehicle according to an embodiment of the present invention includes a small gear having a shaft connectable to a power source, a large gear having an axle as a shaft and meshing with the small gear, and the small gear and the large gear. And a gear box that stores the lubricating oil and stores the lubricating oil. The gearboxes are arranged on the left and right sides of the small gear and the large gear, respectively, and left and right side walls that rotatably support the shaft of the small gear and the shaft of the large gear, and a first end facing the peripheral surface of the small gear Between the wall, the second end wall facing the peripheral surface of the large gear, the bottom wall, the top cover, the left and right side walls, and the large gear, respectively, and above the shaft of the large gear. A pocket. An opening is provided at the top of the pocket and a hole is provided at the bottom of the pocket.

  According to the gear device for a railway vehicle according to the embodiment of the present invention, a part of the splash of the lubricating oil splashed up by the large gear is introduced into the pocket from the opening of the pocket. Thereby, a part of lubricating oil accumulates in a pocket. Here, since the pockets are arranged over a wide range along the left and right side walls, the capacity of the pockets is large. Therefore, a large amount of excess lubricating oil can be stored in the pocket during operation. Thereby, the amount of lubricating oil can be reduced effectively. Therefore, energy loss caused by the circulation of the lubricating oil can be effectively reduced.

FIG. 1 is a front view of the gear device of the present embodiment. 2 is a cross-sectional view taken along line II-II of the gear device shown in FIG. 3 is a sectional view of the gear device shown in FIG. 1 taken along line III-III. 4 is a cross-sectional view of the gear device shown in FIG. 3 taken along line IV-IV. FIG. 5 is a sectional view taken along line VV of the gear device shown in FIG.

  A gear device for a railway vehicle according to an embodiment of the present invention includes a small gear, a large gear, and a gear box. The small gear has a shaft that can be connected to a power source. The large gear has an axle as a shaft and meshes with the small gear. The gearbox stores the small gear and the large gear side by side and stores the lubricating oil. The gear box includes left and right side walls, a first end wall, a second end wall, a bottom wall, an upper lid, and a pocket. The side walls are arranged on the left and right sides of the small gear and the large gear, respectively, and each rotatably supports the shaft of the small gear and the shaft of the large gear. The first end wall faces the peripheral surface of the small gear. The second end wall faces the peripheral surface of the large gear. The pocket is disposed between each of the left and right side walls and the large gear, and above the shaft of the large gear. An opening is provided at the top of the pocket and a hole is provided at the bottom of the pocket.

  According to such a gear device, when the railway vehicle travels, that is, during the operation of the gear device, the lubricating oil stored in the bottom of the gear box is sprung up by the rotating large gear and above the large gear. Scatter. The splashes of the lubricating oil are supplied to meshing portions of gears (small gears and large gears) and bearings. Thereby, each part is lubricated.

  At that time, a part of the splash of lubricating oil is introduced into the pocket from the opening of the pocket. Thereby, a part of lubricating oil accumulates in a pocket. Here, the pocket is disposed between each of the left and right side walls of the gear box and the large gear and above the shaft of the large gear. That is, the pockets are arranged over a wide range along the left and right side walls. In this case, the capacity of the pocket is large. Therefore, a large amount of excess lubricating oil can be stored in the pocket during operation. Thereby, the amount of lubricating oil can be reduced effectively. Therefore, energy loss caused by the circulation of the lubricating oil can be effectively reduced.

  The lubricating oil used to lubricate each part (gear meshing part and bearing) finally returns to the bottom of the gear box. Lubricating oil in the pocket flows out little by little from the hole provided at the bottom of the pocket, and finally returns to the bottom of the gear box. The lubricating oil that has returned to the bottom of the gear box is splashed up again by the large gear. When the railway vehicle stops, all the lubricating oil in the pockets flows out and the pockets become empty. Therefore, at the time of subsequent startup, a sufficient amount of lubricating oil is stored at the bottom of the gear box for lubricating each part.

  Note that the bottom of the pocket is determined according to the shape of the bottom of the pocket. For example, when the bottom of the pocket has one convex region protruding downward, the one convex region is the lowest part of the pocket. When the pocket has a plurality of convex areas protruding downward, each of the plurality of convex areas is the lowest part of the pocket. In this case, the plurality of lowermost portions may have different heights, or all the heights may be the same. One hole may be provided in each of the lowermost portions of the pocket, or a plurality of holes may be provided.

  In the above gear device, the pocket holes are preferably provided so as to face the corresponding side walls. In this case, the lubricating oil that has flowed out of the pocket hole falls away from the gears (small gear and large gear) or travels down the side wall of the gear box. Therefore, the lubricating oil droplets flowing out of the pocket holes do not fall into the meshing portion of the gear. If a drop of lubricating oil falls on the meshing portion of the gear, an impact is applied to the gear. Thereby, energy loss may occur. In short, it is only necessary to provide a hole in the pocket so that the lubricant droplets flowing out from the hole in the pocket do not fall into the meshing portion of the gear. For example, the pocket hole may be provided at a position shifted from directly above the meshing portion of the small gear and the large gear.

  In the above gear device, the pocket is preferably integral with the upper lid. In a typical example, the upper lid is attached to the left and right side walls, the first end wall, and the second end wall by bolts. Even in the case of a normal gear device having an upper lid without a pocket, energy loss can be reduced by replacing the upper lid without the pocket with an upper lid with a pocket. However, the pocket may be integral with each of the left and right side walls.

  Hereinafter, specific examples of the gear device for railway vehicles according to the present embodiment will be described with reference to the drawings.

  FIG. 1 is a front view of the gear device of the present embodiment. 2 is a cross-sectional view taken along line II-II of the gear device shown in FIG. 3 is a sectional view of the gear device shown in FIG. 1 taken along line III-III. 4 is a cross-sectional view of the gear device shown in FIG. 3 taken along line IV-IV. FIG. 5 is a sectional view taken along line VV of the gear device shown in FIG.

  1 to 3, the gear device 1 includes a small gear 2, a large gear 4, and a gear box 6. The gear box 6 accommodates the small gear 2 and the large gear 4 side by side. The large gear 4 meshes with the small gear 2. The small gear 2 and the large gear 4 are, for example, helical gears. However, the type of gear is not particularly limited.

  The gear box 6 includes left and right side walls 7, a first end wall 8, a second end wall 9, a bottom wall 10, and an upper lid 11. The side walls 7 are arranged on the left and right sides of the small gear 2 and the large gear 4, respectively. The first end wall 8 faces the peripheral surface of the small gear 2. The second end wall 9 faces the peripheral surface of the large gear 4. The left and right side walls 7, the first end wall 8 and the second end wall 9 form a space that surrounds the small gear 2 and the large gear 4 from the front, rear, left and right. The lower end of this space is closed by the bottom wall 10. Further, the upper end of the space is closed by the upper lid 11. The upper lid 11 is attached to the left and right side walls 7, the first end wall 8, and the second end wall 9 by, for example, bolts (not shown).

  The small gear 2 has a shaft 3 (hereinafter also referred to as “small gear shaft”) at the center. The small gear shaft 3 is rotatably supported by bearings 12 attached to the left and right side walls 7 of the gear box 6. An electric motor (not shown) is connected to one end of the small gear shaft 3 via a shaft coupling (not shown). That is, the small gear shaft 3 can be connected to a power source. The bearing 12 is a conical roller bearing, for example. However, the type of the bearing is not particularly limited.

  The large gear 4 has an axle 5 as an axis. The axle 5 is fitted into the center of the large gear 4 and integrated with the large gear 4. The axle 5 is rotatably supported by bearings 13 respectively attached to the left and right side walls 7 of the gear box 6. Wheels (not shown) are fitted into both ends of the axle 5 respectively. Thereby, the large gear 4 is integrated with the axle 5 and the wheel. The bearing 13 is a conical roller bearing, for example. However, the type of the bearing is not particularly limited.

  Lubricating oil L is stored in the gear box 6. Specifically, the lubricating oil L is stored at the bottom of the gear box 6 so that the lower portion of the large gear 4 is immersed (see FIG. 2).

  With reference to FIGS. 2 to 5, the gear box 6 includes a pocket 15 in the present embodiment. The pocket 15 is disposed between each of the left and right side walls 7 and the large gear 4. Further, the pockets 15 are respectively arranged above the axis of the large gear 4 (axle 5). In this way, the pockets 15 are arranged over a wide range along the left and right side walls 7. 2 and 3 show examples in which the pocket 15 includes the entire range of the large gear 4 in the front-rear direction. Further, the bottom of the pocket 15 shown in FIGS. 2 and 3 has two convex areas protruding downward. Each of the two convex regions becomes the lowermost portion of the pocket 15.

  An opening 16 is provided above the pocket 15. The upper end of the internal space of the pocket 15 is opened in the gear box 6 by the opening 16. A hole 17 is provided at the bottom of the pocket 15 (see FIGS. 3 and 5). FIG. 3 shows an example in which the hole 17 of the pocket 15 is provided at a position shifted from directly above the meshing portion of the small gear 2 and the large gear 4. FIG. 5 shows an example in which the holes 17 of the pockets 15 are inclined toward the corresponding side walls 7 so as to face the side walls 7. The pocket 15 is integrally formed with the upper lid 11 of the gear box 6 by casting or the like.

  According to the gear device 1 of the present embodiment, when the railway vehicle travels, that is, during operation of the gear device 1, the lubricating oil L stored at the bottom of the gear box 6 is splashed by the rotating large gear 4. , Scattered above the large gear 4. The splashes of the lubricating oil are supplied to the meshing portions of the gears (the small gear 2 and the large gear 4) and the bearings 12 and 13. Thereby, each part is lubricated. At that time, a part of the splash of lubricating oil splashed up by the large gear 4 is introduced into the pocket 15 from the opening 16 of the pocket 15. As a result, part of the lubricating oil accumulates in the pocket 15. Therefore, a large amount of excess lubricating oil can be stored in the pocket 15 during the operation of the gear device 1. Thereby, the amount of lubricating oil can be reduced effectively. Therefore, energy loss caused by the circulation of the lubricating oil can be effectively reduced.

  The lubricating oil used for lubricating each part (the meshing part of the small gear 2 and the large gear 4 and the bearings 12 and 13) finally returns to the bottom of the gear box 6. The lubricating oil in the pocket 15 flows out little by little from the hole 17 of the pocket 15 as needed, and finally returns to the bottom of the gear box 6. The lubricating oil L that has returned to the bottom of the gear box 6 is rebounded by the large gear 4 again. When the railway vehicle stops, all the lubricating oil in the pocket 15 flows out thereafter, and the pocket 15 becomes empty. Therefore, at the time of subsequent startup, a sufficient amount of lubricating oil L is stored at the bottom of the gear box 6 for lubricating each part.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The gear device of the present invention can be effectively used for all railway vehicles.

DESCRIPTION OF SYMBOLS 1 Gear device 2 Small gear 3 Small gear shaft 4 Large gear 5 Axle 6 Gear box 7 Side wall 8 First end wall 9 Second end wall 10 Bottom wall 11 Upper lid 12 Bearing 13 Bearing 15 Pocket 16 Opening 17 Hole L Lubricating oil

Claims (3)

A small gear having a shaft connectable to a power source;
A large gear having an axle as a shaft and meshing with the small gear;
A gear unit for a railway vehicle, comprising: a gear box that stores the small gear and the large gear side by side and stores lubricating oil;
The gear box is
Left and right sidewalls respectively disposed on the left and right of the small gear and the large gear, each rotatably supporting the shaft of the small gear and the shaft of the large gear;
A first end wall facing the peripheral surface of the small gear;
A second end wall facing the peripheral surface of the large gear;
The bottom wall,
An upper lid,
A pocket disposed between each of the left and right side walls and the large gear and above the shaft of the large gear, and
A gear device, wherein an opening is provided at an upper portion of the pocket and a hole is provided at a lowermost portion of the pocket. The gear device according to claim 1,
The gear device, wherein the holes of the pockets are provided so as to face the corresponding side walls. The gear device according to claim 1 or 2,
A gear device in which the pocket is integral with the upper lid.

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