JP2021080994A - Gear device for railway vehicle - Google Patents

Abstract

To prevent a large amount of lubricating oil from flowing down to an arrangement part of a bearing 7 for an axle of an axial direction one side by a motion component to the axial direction one side to be applied to lubricating oil scraped up by a large gear 5 in a gear device for a railway vehicle which stores a small gear fixed to an input axis and the large gear 5 fixed to an axle 4 in a mutually and horizontally engaged state in a gear box 1, has the bearing for input axis and the bearing 7 for an axle attached to a side wall part 11 on axial both sides of the gear box 1, and provided with a box lid 8 including a flange part 81 covering an opening formed on a top surface of the gear box 1, a rising part 82 of axial both sides rising from the flange part 81 and a ceiling part 83 covering the top edge of both rising parts 82.SOLUTION: A ceiling part 83 of a box lid 8 has a groove part 831 recessed upward, extending in a circumferential direction of a large gear 5.SELECTED DRAWING: Figure 2

Description

The present invention includes a gear box, and the small gear fixed to the input shaft driven by the drive source and the large gear fixed to the axle are housed in the gear box in a state of being horizontally meshed with each other. The present invention relates to a gear device for a railroad vehicle in which a bearing for an input shaft and a bearing for an axle are attached to side wall portions on both sides in the axial direction of the gear box.

Conventionally, as a gear device for a railroad vehicle of this type, a gear box has an opening on the upper surface into which a large gear can be inserted from above, and a box lid covering the opening is attached to the upper surface of the gear box. (See, for example, Patent Document 1). In this case, the box lid has a flange portion seated on the opening peripheral edge portion on the upper surface of the gear box, rising portions on both sides in the axial direction rising from the flange portion, and a ceiling portion straddling the upper end of the compatible rising portion. .. Further, in the gear device for railway vehicles, the lubricating oil stored in the lower part of the gear box is scooped up by the large gear, and the lubricating oil is supplied to each lubrication point including the meshing point between the small gear and the large gear. I am trying to do it.

By the way, due to the twisting of the tooth streaks of the large gear composed of the helical gear, the lubricating oil scooped up by the large gear is provided with a kinetic component in one axial direction. Therefore, the lubricating oil flows unevenly from the ceiling of the box lid toward the rising portion in one axial direction, and a large amount of lubricating oil travels along the side wall portion in one axial direction of the gearbox to arrange the bearing for one axle in the axial direction. Flow down to. Further, when the rotation speed of the large gear exceeds a predetermined speed, the reason is not clear, but the lubricating oil scooped up by the large gear flows unevenly from the ceiling of the box lid toward the other rising portion in the axial direction, resulting in a large amount. Lubricating oil flows down the other side wall portion in the axial direction of the gearbox to the arrangement portion of the other axle bearing in the axial direction.

Here, a labyrinth seal is provided on the outer side of the axle bearing in the axial direction so that the lubricating oil supplied to the bearing does not leak to the outside, but a large amount of lubricating oil is applied to the bearing arrangement portion as described above. If it flows down, the labyrinth seal alone cannot prevent the leakage of lubricating oil. Therefore, conventionally, in addition to the labyrinth seal, a rubber oil seal is provided on the outer side of the axle bearing in the axial direction. However, the oil seal is a consumable item and needs to be replaced, which makes maintenance troublesome.

Jitsukaisho 64-46572

In view of the above points, the present invention suppresses the flow of a large amount of lubricating oil to the arrangement portion of the axle bearing, and prevents the lubricating oil supplied to the axle bearing from leaking to the outside without providing an oil seal. Alternatively, it is an object of the present invention to provide a gear device for a railroad vehicle which can be prevented even if the replacement frequency of the oil seal is reduced.

In order to solve the above problems, the present invention includes a gear box, in which the small gear fixed to the input shaft rotationally driven by the drive source and the large gear fixed to the axle are in the horizontal direction with each other. It is a gear device for railway vehicles in which a bearing for an input shaft and a bearing for an axle are attached to the side wall portions on both sides in the axial direction of the gear box, and the gear box is a large gear. Has an opening on the upper surface that can be inserted from above, and a box lid that covers this opening is attached to the upper surface of the gear box. In those having rising portions on both sides in the axial direction to rise and a ceiling portion straddling the upper end of the compatible rising portion, the ceiling portion of the box lid shall have an upwardly recessed groove portion extending in the circumferential direction of the large gear. It is characterized by.

According to the present invention, the lubricating oil scooped up by the large gear is easily guided in the circumferential direction of the large gear along the groove in the ceiling of the box lid. Therefore, even if a moving component in one axial direction is applied to the pumped lubricating oil, it becomes difficult for the lubricating oil to flow unevenly from the ceiling of the box lid to the rising portion on one axial side, and the axle on one side in the axial direction. It is possible to prevent a large amount of lubricating oil from flowing down to the portion where the bearing is arranged. Therefore, leakage of the lubricating oil supplied to the axle bearing to the outside can be prevented without providing the oil seal or even if the replacement frequency of the oil seal is reduced, and the maintainability is improved.

The cut side view of the gear device for a railroad vehicle of an embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. Sectional drawing taken along the line III-III of FIG.

With reference to FIG. 1, the rail vehicle gear device according to the embodiment of the present invention includes a gear box 1. Inside the gearbox 1, there are a small gear 3 made of helical gears fixed to an input shaft 2 (see FIG. 3) that is rotationally driven by a drive source (not shown) and a helical gear fixed to an axle 4. The large gears 5 are housed in a state of being meshed with each other in the horizontal direction. With reference to FIGS. 2 and 3, a pair of input shaft bearings 6 and 6 for axially supporting the input shaft 2 and a pair for axially supporting the axle 4 are provided on the side wall portions 11 and 11 on both sides of the gear box 1 in the axial direction. Axle bearings 7 and 7 are attached. Specifically, each side wall portion 11 is formed with an opening 111 that is concentric with the input shaft 2 and has a diameter larger than that of the small gear 3, and an opening 112 that is concentric with the axle 4 and has a diameter smaller than that of the large gear 5. Then, the bearing box 61 containing the bearing 6 for the input shaft is attached to each side wall portion 11 so as to close the opening 111, and the bearing box 71 containing the bearing 7 for the axle is provided with the opening 112 in each side wall portion 11. It is installed so that it is closed. The small gear 3 is integrally formed with the input shaft 2 and is inserted into the gear box 1 through the opening 111 of the side wall portion 11 on one side in the axial direction. It is also possible to externally fix the small gear 3 which is different from the input shaft 2 to the input shaft 2.

The lower part of the gearbox 1, first the oil reservoir 12 ₁ lower portion of the gear wheel 5 is dipped, the second oil sump 12 ₂ located below the small gear 3, the first oil sump 12 ₁ and the second oil sump 12 ₂ and the partition wall 13 for partitioning the is provided. The partition wall 13, a communication hole 131 for communicating the first oil sump 12 ₁ and the second oil sump 12 ₂ is formed. The lubricating oil stored in the first oil sump portion 12 ₁ is scooped up by the rotation of the large gear 5, such as the meshing point between the small gear 3 and the large gear 5 and the bearings 6 and 7 for the input shaft and the axle. The pumped lubricating oil is supplied to each lubrication point. Incidentally, the portion of the gear box 1 as the first oil sump 12 ₁ of the bottom surface has an opening is formed, the opening plug 14 is mounted. A drain bolt 141 is attached to the plug body 14, and by removing the drain bolt 141, the lubricating oil in the gear box 1 can be discharged to the outside.

Further, the gear box 1 has an opening 15 on the upper surface into which the large gear 5 can be inserted from above. A box lid 8 that covers the opening 15 is attached to the upper surface of the gear box 1. The box lid 8 has a flange portion 81 seated on the opening peripheral edge portion 151 on the upper surface of the gear box 1, rising portions 82 and 82 on both sides in the axial direction rising from the flange portion 81, and a ceiling straddling the upper ends of the compatible rising portions 82 and 82. It has a part 83.

By the way, as described earlier in the column of background technology, the lubricating oil scooped up by the large gear 5 is axially oriented from the ceiling portion 83 of the box lid 8 due to the kinetic component applied to the large gear 5 in the axial direction. There is a possibility that a large amount of lubricating oil will flow toward the rising portion 82 on one side and flow down along the side wall portion 11 on one side in the axial direction of the gear box 1 to the arrangement portion of the axle bearing 7 on one side in the axial direction. Here, a cover 72 is attached to the axially outer end of the bearing box 71 containing the axle bearing 7. A plurality of labyrinth seal portions 73 are provided in the bearing box 71 and in the cover 72 to prevent the lubricating oil supplied to the axle bearing 7 from leaking to the outside. However, if a large amount of lubricating oil flows down to the arrangement portion of the axle bearing 7, the amount of lubricating oil supplied to the axle bearing 7 becomes excessive, and the labyrinth seal portion 73 alone prevents the lubricating oil from leaking to the outside. It will not be possible and it will be necessary to provide a rubber oil seal.

Therefore, in the present embodiment, the ceiling portion 83 of the box lid 8 is provided with an upwardly recessed groove portion 831 extending in the circumferential direction of the large gear 5. Specifically, half of the ceiling portion 83 on each side in the axial direction is composed of an inclined portion 832 extending diagonally upward from the upper end of the rising portion 82 on each side in the axial direction, and the ceiling portion 83 is formed by an inverted V-shaped groove portion. It is formed to have 831.

According to this, the lubricating oil scooped up by the large gear 5 is easily guided in the circumferential direction of the large gear 5 through the groove 831 of the ceiling portion 83 of the box lid 8. Therefore, even if a moving component in one axial direction is applied to the scraped lubricating oil, the lubricating oil is less likely to flow unevenly from the ceiling portion 83 of the box lid 8 toward the rising portion 82 on one side in the axial direction, and the lubricating oil is less likely to flow in the axial direction. It is possible to prevent a large amount of lubricating oil from flowing down to the arrangement portion of the axle bearing 7 on one side. Therefore, leakage of the lubricating oil supplied to the axle bearing 7 to the outside can be prevented without providing an oil seal. As a result, it is not necessary to replace the oil seal, and maintainability can be improved. Further, even when the oil seal is provided on the outside of the axle bearing 7, the lubricating oil does not leak to the outside even if the oil seal deteriorates considerably, so that the frequency of oil seal replacement can be reduced and maintainability is maintained. Is improved.

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, in the above embodiment, the ceiling portion 83 of the box lid 8 has an inverted V-shaped groove portion 831, but the shape of the groove portion 831 may be, for example, an arch shape other than the inverted V shape.

1 ... Gear box, 11 ... Side wall, 15 ... Upper surface opening, 151 ... Opening periphery, 2 ... Input shaft, 3 ... Small gear, 4 ... Axle, 5 ... Large gear, 6 ... Input shaft bearing, 7 ... Axle bearings, 8 ... box lids, 81 ... flanges, 82 ... rising parts, 83 ... ceiling parts, 831 ... grooves.

Claims (1)

A gearbox is provided, and the small gear fixed to the input shaft driven by the drive source and the large gear fixed to the axle are housed in the gearbox in a horizontally meshed state. A gear device for railway vehicles in which bearings for input shafts and bearings for axles are attached to the side walls on both sides in the axial direction.
The gearbox has an opening on the upper surface into which large gears can be inserted from above, and a box lid covering this opening is attached to the upper surface of the gearbox, and the box lid is a flange seated on the peripheral edge of the opening on the upper surface of the gearbox. In those having a portion, rising portions on both sides in the axial direction rising from the flange portion, and a ceiling portion straddling the upper end of the compatible rising portion.
A gear device for railway vehicles, wherein the ceiling portion of the box lid has a groove portion recessed upward, which extends in the circumferential direction of the large gear.

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