Gear device
The gear device for railway vehicles addresses the issue of insufficient lubrication by redirecting oil outward with inclined tooth traces and ribs, preventing bearing wear and oil deterioration.
Patent Information
- Application Number
- JP2024082819
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-12-04
AI Technical Summary
The rotation direction of the gear and pinion in railway vehicles causes lubricating oil to be splashed inward during forward rotation, leading to insufficient supply to bearings and increased wear, which can mix iron into the oil, accelerating its deterioration and increasing temperature due to agitation resistance.
A gear device with a large gear and pinion gear featuring inclined tooth traces and a lid with ribs that face grooves between the gears, redirecting lubricating oil outward during forward rotation to ensure adequate supply to bearings without increasing oil volume.
The gear device effectively suppresses bearing wear by ensuring consistent lubrication without increasing lubricating oil quantity, maintaining efficient operation and reducing oil deterioration.
Smart Images
Figure 2025176574000001_ABST
Abstract
Description
[Technical Field]
[0001] The present disclosure relates to gearing for rail vehicles. [Background technology]
[0002] In railway vehicles, the power of the motor is transmitted to the axles, causing the wheels to rotate together with the axles. This allows the railway vehicle to run on rails. A gear device is used to transmit power to the axles. The gear device includes a large gear and a small gear. The large gear is connected to the axles. The small gear is connected to a small gear shaft. The small gear shaft is connected to the drive shaft of the motor, for example, via a coupling.
[0003] The large gear and pinion are housed in a gearbox. The axle and pinion shaft are rotatably supported by bearings, respectively. The bearings are arranged on both sides of the large gear and the pinion in the axial direction. Lubricating oil is stored in the gearbox. The lubricating oil is scooped up by the rotation of the large gear and supplied to the meshing portion between the large gear and the pinion and to each bearing.
[0004] A gear device is disclosed, for example, in Patent Document 1. In the gear device of Patent Document 1, the large gear and the small gear are both double helical gears. The double helical gear includes a pair of helical gears having tooth traces that are inclined in opposite directions relative to the axial direction. [Prior art documents] [Patent documents]
[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-71607 Summary of the Invention [Problem to be solved by the invention]
[0006] The rotation direction of the gear and pinion is switched appropriately depending on the direction of travel of the railway vehicle. When the gear is a double helical gear, the direction of movement of the lubricating oil scooped up by the rotation of the gear changes depending on the rotation direction of the gear. When the gear device rotates forward, the lubricating oil is thrown inward in the axial direction of the gear. When the gear device rotates reversely, the lubricating oil is thrown outward in the axial direction of the gear. Forward rotation means that the gear is rotating so that the outside of its tooth trace is forward in the direction of rotation and the inside of its tooth trace is backward in the direction of rotation in the axial direction of the gear. Reverse rotation means that the gear is rotating so that the outside of its tooth trace is backward in the direction of rotation and the inside of its tooth trace is forward in the direction of rotation in the axial direction of the gear.
[0007] During forward rotation of the gear device, the lubricating oil is splashed toward the axially inner side of the large gear, which can lead to an insufficient supply of lubricating oil to the bearings. When the amount of lubricating oil supplied to the bearings is insufficient, the bearings are more likely to wear, and iron is mixed into the lubricating oil. This causes the lubricating oil to turn black, accelerating its deterioration. Conventionally, to suppress bearing wear, the amount of lubricating oil stored in the gearbox has been increased. However, increasing the amount of lubricating oil increases agitation resistance, which creates the problem of an increase in the temperature of the gear device.
[0008] An object of the present disclosure is to provide a gear device for a railway vehicle that can suppress bearing wear without increasing the amount of lubricating oil. [Means for solving the problem]
[0009] A gear device for a railway vehicle according to the present disclosure includes a large gear, a pinion gear, a gearbox, and a lid. The large gear is connected to an axle. The large gear includes a pair of first gears and a first groove. Each of the pair of first gears has a plurality of tooth traces. The first groove is provided between the pair of first gears. The tooth traces of one of the pair of first gears and the tooth traces of the other of the pair of first gears are inclined in opposite directions relative to the axial direction of the large gear. The pinion gear is connected to a pinion gear shaft. The pinion gear includes a pair of second gears and a second groove. Each of the pair of second gears has a plurality of tooth traces. The pair of second gears mesh with the pair of first gears. The second groove is provided between the pair of second gears. The tooth traces of one of the pair of second gears and the tooth trace of the other of the pair of second gears are inclined in opposite directions relative to the axial direction. The gearbox houses the large gear and the pinion gear. The gearbox has an opening at an upper part. The lid closes the opening of the gearbox. The bottom of the gearbox is capable of storing lubricating oil so that at least a portion of the gear is immersed. The inner surface of the lid includes a first region. The first region has a shape that follows the gear in a cross section perpendicular to the axial direction. The first region is provided with a rib that faces the first groove. [Effects of the Invention]
[0010] According to the gear device for a railway vehicle according to the present disclosure, it is possible to suppress bearing wear without increasing the amount of lubricating oil. [Brief explanation of the drawings]
[0011] [Figure 1] FIG. 1 is a schematic diagram of a railway vehicle. [Figure 2] FIG. 2 is a cross-sectional view of the gear device according to the first embodiment, cut perpendicular to the axial direction. [Figure 3] FIG. 3 is a top view of the gear wheel and pinion. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV of FIG. [Figure 6] FIG. 6 is a cross-sectional view of a gear device according to a second embodiment, cut perpendicular to the axial direction. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a gear device according to a modified example of each embodiment, cut perpendicular to the axial direction. [Figure 9] FIG. 9 is a cross-sectional view of a gear device according to a modified example of the second embodiment, cut perpendicular to the axial direction. DETAILED DESCRIPTION OF THE INVENTION
[0012] A gear device for a railway vehicle according to an embodiment includes a large gear, a pinion gear, a gearbox, and a lid. The large gear is connected to an axle. The large gear includes a pair of first gears and a first groove. Each of the pair of first gears has a plurality of tooth traces. The first groove is provided between the pair of first gears. The tooth traces of one of the pair of first gears and the tooth traces of the other of the pair of first gears are inclined in opposite directions relative to the axial direction of the large gear. The pinion gear is connected to a pinion gear shaft. The pinion gear includes a pair of second gears and a second groove. Each of the pair of second gears has a plurality of tooth traces. The pair of second gears mesh with the pair of first gears. The second groove is provided between the pair of second gears. The tooth traces of one of the pair of second gears and the tooth trace of the other of the pair of second gears are inclined in opposite directions relative to the axial direction. The gearbox houses the large gear and the pinion gear. The gearbox has an opening at an upper part. The lid closes the opening of the gearbox. The bottom of the gearbox is capable of storing lubricating oil so that at least a portion of the gear is immersed. The inner surface of the lid includes a first region. The first region has a shape that follows the gear in a cross section perpendicular to the axial direction. The first region is provided with a rib that faces the first groove (first configuration).
[0013] In the gear device of the first configuration, a rib is provided on the inner surface of the cover in a first region shaped along the large gear. This rib faces a first groove formed between the first gears of the large gear. In this case, even if lubricating oil is splashed toward the first groove, i.e., toward the inside of the large gear in the axial direction, during forward rotation of the gear device, the rib bounces the lubricating oil back toward the outside in the axial direction. This makes it easier to supply lubricating oil to the bearings provided on both axial sides of the large gear and the pinion, even during forward rotation of the gear device. Therefore, the gear device of the first configuration can suppress bearing wear without increasing the amount of lubricating oil.
[0014] In the gear device according to the first configuration, the inner surface of the cover may further include a second region. The second region has a shape that follows the pinion in a cross section perpendicular to the axial direction. The second region is provided with a rib that faces the second groove (second configuration).
[0015] In the gear device of the second configuration, a rib is further provided on the inner surface of the cover in a second region shaped along the pinion. This rib faces the second groove formed between the second pinion and the pinion. In this case, the lubricating oil is repelled axially outward by the rib on the pinion side as well as on the gear side. Therefore, with the second configuration, the amount of lubricating oil supplied to the bearing can be increased.
[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components are designated by the same reference numerals, and the same description will not be repeated.
[0017] First Embodiment FIG. 1 is a schematic diagram of a railway vehicle 1. Referring to FIG. 1, the railway vehicle 1 includes a bogie frame 2, an axle 3, a plurality of wheels 4, a motor 5, and a gear train 10. The axle 3 is supported by the bogie frame 2. The wheels 4 are connected to both ends of the axle 3. The motor 5 is supported by the bogie frame 2. The gear train 10 transmits power from the motor 5 to the axle 3. The gear train 10 is connected to the axle 3 and a pinion gear shaft 6. When the gear train 10 is installed on the railway vehicle 1, the axle 3 and the pinion gear shaft 6 extend substantially perpendicular to the longitudinal and vertical directions of the railway vehicle 1. In other words, the axial direction of the axle 3 substantially coincides with the axial direction of the pinion gear shaft 6. The pinion gear shaft 6 is connected to a drive shaft 8 of the motor 5, for example, via a coupling 7. The pinion gear shaft 6 rotates by the power of the motor 5.
[0018] The axle 3 is rotatably supported by a bearing 3a. The pinion shaft 6 is rotatably supported by a bearing 6a. The bearings 3a and 6a are disposed inside the gear device 10, for example.
[0019] 2 is a cross-sectional view of the gear device 10 according to this embodiment, cut perpendicularly to the axial direction of the axle 3. Referring to FIG. 2, the gear device 10 includes a large gear 11, a small gear 12, a gear box 13, and a cover 14.
[0020] The large gear 11 is connected to the axle 3. The pinion 12 is connected to the pinion shaft 6. The large gear 11 and the pinion 12 mesh with each other. The pinion 12 rotates together with the pinion shaft 6 by the power of the motor 5 (Fig. 1). The large gear 11 receives power from the pinion 12 and rotates together with the axle 3. The axial direction of the large gear 11 substantially coincides with the axial direction of the axle 3. The axial direction of the pinion 12 substantially coincides with the axial direction of the large gear 11. Hereinafter, the axial direction of the large gear 11 may be simply referred to as the axial direction. Furthermore, the front-to-rear and up-to-down directions of the railway vehicle 1 (Fig. 1) with the gear device 10 installed may be simply referred to as the front-to-rear and up-to-down directions, respectively.
[0021] The gearbox 13 houses the large gear 11 and the small gear 12. In the gearbox 13, the large gear 11 and the small gear 12 are arranged side by side in the front-to-rear direction. The gearbox 13 has an opening at the top. A bottom 131 of the gearbox 13 is capable of storing lubricating oil LO. When the lubricating oil LO is stored in the bottom 131, at least a portion of the large gear 11 is immersed in the lubricating oil LO. Figure 2 shows a state in which the lubricating oil LO is stored in the gearbox 13. The small gear 12 is arranged, for example, above and spaced apart from the lubricating oil LO.
[0022] The lid 14 closes the opening of the gear box 13. The gear box 13 and the lid 14 form an internal space of the gear device 10. The large gear 11 and the small gear 12 are housed in this internal space. The lid 14 is detachable from the gear box 13.
[0023] The cover 14 includes an inner surface 141 and an outer surface 142. The inner surface 141 is a surface that is disposed on the side of the internal space of the gear device 10. The outer surface 142 is a surface that is disposed on the opposite side to the inner surface 141. In the example of FIG. 2, the inner surface 141 and the outer surface 142 have different shapes. However, the inner surface 141 and the outer surface 142 may have substantially the same shape.
[0024] The inner surface 141 of the lid 14 includes a first region 20. The first region 20 corresponds to the gear wheel 11. Specifically, the first region 20 has a shape that follows the gear wheel 11 in a cross section perpendicular to the axial direction. The first region 20 may have a substantially arc shape that follows a portion of the gear wheel 11 in a cross section perpendicular to the axial direction. In the example of this embodiment, the entire area of the inner surface 141 of the lid 14 that is within the range of the gear wheel 11 in the front-to-rear direction is the first region 20.
[0025] Ribs 21 are provided in the first region 20. The ribs 21 extend along the circumferential direction of the gear wheel 11. In the example of FIG. 2, the ribs 21 are provided over the entire first region 20 in the front-to-rear direction. However, the ribs 21 may be provided only in a part of the first region 20. For example, the ribs 21 may be provided only within the range of the axle 3 in the front-to-rear direction of the first region 20. The ribs 21 protrude from the first region 20 (the inner surface 141 of the lid 14) toward the radially inward side of the gear wheel 11. The protruding height of the ribs 21 is typically substantially constant over the entire length of the ribs 21. However, the protruding height of the ribs 21 may vary in the extension direction of the ribs 21.
[0026] The gearbox 13, the cover 14, and the rib 21 are made of materials such as aluminum or steel. The gearbox 13, the cover 14, and the rib 21 are typically made of the same material, but may be made of different materials.
[0027] The lid 14 is joined to the gearbox 13 by, for example, bolts, welding, etc. The ribs 21 are provided, for example, integrally with the lid 14. However, the ribs 21 may be separate from the lid 14. When the ribs 21 and the lid 14 are separate, the ribs 21 are joined to the inner surface 141 of the lid 14 by, for example, bolts, welding, etc.
[0028] 3 is a top view of the gear 11 and the pinion 12. Referring to FIG. 3, the gear 11 is a double helical gear. The gear 11 includes a pair of gears 111a and 111b and a groove 112.
[0029] Each of the gears 111a and 111b is a helical gear. The pair of gears 111a and 111b are arranged with a gap in the axial direction. Each of the gears 111a and 111b has a plurality of teeth arranged along the circumferential direction of the gear 11. The gears 111a and 111b have a plurality of tooth traces 1111a and 1111b, respectively. The tooth trace 1111a on one of the gears 111a and 111b and the tooth trace 1111b on the other of the gears 111a and 111b are inclined in opposite directions relative to the axial direction. When viewed from above the gear 11 and the pinion 12, the tooth traces 1111a and 1111b of the gears 111a and 111b are inclined relative to the axial direction so that the outer portion in the axial direction is located closer to the pinion 12 than the inner portion.
[0030] The groove 112 is provided between the gears 111a and 111b. The groove 112 is annular and is provided along the circumferential direction of the gear 11.
[0031] The pinion 12 is a double helical gear and includes a pair of gears 121a and 121b and a groove 122.
[0032] Each of the gears 121a and 121b is a helical gear. The pair of gears 121a and 121b are arranged with a gap in the axial direction. Each of the gears 121a and 121b has a plurality of teeth arranged along the circumferential direction of the pinion 12. The gears 121a and 121b have a plurality of tooth traces 1211a and 1211b, respectively. The tooth trace 1211a on one of the gears 121a and 121b and the tooth trace 1211b on the other of the gears 121a and 121b are inclined in opposite directions relative to the axial direction. When viewed from above the gear 11 and the pinion 12, the tooth traces 1211a and 1211b of the gears 121a and 121b are inclined relative to the axial direction so that the outer portions in the axial direction are located closer to the gear 11 than the inner portions. The gear 121a meshes with the gear 111a, and the gear 121b meshes with the gear 111b. The number of teeth of the gears 121a and 121b is smaller than the number of teeth of the gears 111a and 111b. The diameters of the pitch circles of the gears 121a and 121b are, for example, smaller than the diameters of the pitch circles of the gears 111a and 111b. The value obtained by dividing the diameter of the pitch circle of the gear 121a by the number of teeth is equal to the value obtained by dividing the diameter of the pitch circle of the gear 111a by the number of teeth. Similarly, the value obtained by dividing the diameter of the pitch circle of the gear 121b by the number of teeth is equal to the value obtained by dividing the diameter of the pitch circle of the gear 111b by the number of teeth.
[0033] The groove 122 is provided between the gears 121a and 121b. The groove 122 is annular and is provided along the circumferential direction of the pinion 12.
[0034] Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 2. Fig. 4 shows a cross-section of the gear device 10 taken along the axial direction at the position of the central axis of the large gear 11.
[0035] Referring to Fig. 4, the gear 11 is arranged between the bearings 3a in the axial direction. The rib 21 provided on the lid 14 is also arranged between the bearings 3a in the axial direction. The rib 21 faces the groove 112 of the gear 11. The rib 21 is located between the gears 111a and 111b in the axial direction. In the example shown in Fig. 4, the rib 21 is formed on the inner surface 141 of the lid 14 so that at least its tip portion is located radially inward of the gear 11 with respect to the tooth crests of the gears 111a and 111b.
[0036] In a cross-sectional view of the gear device 10 cut along the axial direction, the width W1 of the rib 21 is smaller than, for example, the width W2 of the groove 112. Here, the width W1 of the rib 21 refers to the maximum width of the rib 21 (the dimension in the axial direction). Similarly, the width W2 of the groove 112 refers to the maximum width of the groove 112.
[0037] The rib 21 may have inclined surfaces 211 on both sides in the axial direction. Each of the inclined surfaces 211 is inclined in the up-down direction in a cross-sectional view of the gear device 10 cut along the axial direction. In a cross-sectional view of the gear device 10 cut along the axial direction, the inclined surfaces 211 are inclined in a direction perpendicular to the axial direction so as to move away from each other, for example, from the groove 112 side toward the lid 14 side. In this case, the shape of the rib 21 is trapezoidal, triangular, or the like in a cross-sectional view of the gear device 10 cut along the axial direction. However, the rib 21 does not necessarily have to include the inclined surfaces 211. The shape of the rib 21 may be rectangular, for example, in a cross-sectional view of the gear device 10 cut along the axial direction.
[0038] Fig. 5 is a VV cross-sectional view of Fig. 2. Fig. 5 shows a cross-section of the gear device 10 taken along the axial direction at the position of the central axis of the pinion 12.
[0039] 5, the pinion 12 is disposed between the bearings 6a in the axial direction. In this embodiment, no rib is provided within the range of the pinion 12 on the inner surface 141 of the lid 14 in the front-rear direction.
[0040] (effect) In the gear device 10 according to this embodiment, a rib 21 is provided on the inner surface 141 of the lid 14 in the first region 20 shaped to follow the shape of the large gear 11. The rib 21 faces a groove 112 formed between the gears 111a and 111b of the large gear 11. In this case, even if the lubricating oil LO is splashed toward the groove 112, i.e., toward the inside in the axial direction of the large gear 11, during forward rotation of the gear device 10, the lubricating oil LO is bounced back toward the outside in the axial direction by the rib 21. This makes it easier to supply the lubricating oil LO to the bearings 3a and 6a provided on both sides of the large gear 11 and the pinion 12, even during forward rotation of the gear device 10. Therefore, the gear device 10 according to this embodiment can suppress wear of the bearings 3a and 6a without increasing the amount of lubricating oil LO.
[0041] When assembling the gear device 10, for example, the large gear 11 and the pinion 12 are placed inside the gear box 13, and then the large gear 11 is connected to the axle 3, and the pinion 12 is connected to the pinion shaft 6. Then, the opening of the gear box 13 is closed with the lid 14. In this way, closing with the lid 14 is usually performed after the internal assembly of the gear box 13 is completed. Therefore, there is no interference between the rib 21 and other parts inside the gear box 13 (such as the large gear 11 and pinion 12) during the internal assembly of the gear device 10. Therefore, the gear device 10 can be easily assembled.
[0042] The rib 21 may have inclined surfaces 211 on both sides in the axial direction. For example, in a cross-sectional view of the gear device 10 cut along the axial direction, the inclined surfaces 211 are inclined relative to a direction perpendicular to the axial direction so as to move away from each other from the groove 112 side toward the lid 14 side. In this case, in a cross-sectional view of the gear device 10 cut along the axial direction, the angle between the inclined surfaces 211 and the lubricating oil LO splashing obliquely becomes close to a right angle. Therefore, with this gear device 10, the inclined surfaces 211 make it easier to bounce back the lubricating oil LO.
[0043] Second Embodiment Fig. 6 is a cross-sectional view of a gear device 10A according to a second embodiment, cut perpendicular to the axial direction. Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6. Fig. 7 can also be considered a cross-sectional view of the gear device 10A cut along the axial direction. Referring to Figs. 6 and 7, the gear device 10A differs from the gear device 10 of the first embodiment in the shape of the cover 14.
[0044] In the gear device 10A of this embodiment, the inner surface 141 of the lid 14 further includes a second region 30. The second region 30 corresponds to the pinion 12. Specifically, the second region 30 has a shape that follows the pinion 12 in a cross section perpendicular to the axial direction. In the example of this embodiment, the entire area of the inner surface 141 of the lid 14 that is within the range of the pinion 12 in the front-to-rear direction is the second region 30.
[0045] Ribs 31 are provided in the second region 30. The ribs 31 extend along the circumferential direction of the pinion gear 12. In the example shown in FIG. 6, the ribs 31 are provided over the entire second region 30 in the front-rear direction. However, the ribs 31 may be provided only in a portion of the second region 30. For example, the ribs 31 may be provided only within the range of the pinion gear shaft 6 in the front-rear direction of the second region 30. The ribs 31 protrude from the second region 30 (the inner surface 141 of the lid 14) toward the inside in the radial direction of the pinion gear 12. The protruding height of the ribs 31 is typically substantially constant over the entire length of the ribs 31. However, the protruding height of the ribs 31 may vary in the extension direction of the ribs 31. The material of the ribs 31 may be the same as that of the ribs 21 in the first region 20, for example. In the example of this embodiment, the ribs 31 and the ribs 21 in the first region 20 are spaced apart from each other in a cross section perpendicular to the axial direction.
[0046] The rib 31 provided on the lid 14 is arranged between the bearings 6a in the axial direction. The rib 31 faces the groove 122 of the pinion 12. The rib 31 is located between the gears 121a and 121b in the axial direction. In the example shown in Fig. 7, the rib 31 is formed on the inner surface 141 of the lid 14 so that at least its tip portion is located radially inward of the gear 11 with respect to the tooth crests of the gears 121a and 121b.
[0047] In a cross-sectional view of the gear device 10A cut along the axial direction, the width W3 of the rib 31 is smaller than, for example, the width W4 of the groove 122. Here, the width W3 of the rib 31 refers to the maximum width (dimension in the axial direction) of the rib 31. Similarly, the width W4 of the groove 122 refers to the maximum width of the groove 122.
[0048] The ribs 31 may have a shape similar to that of the ribs 21 of the first region 20 in a cross section taken along the axial direction of the gear device 10A. The ribs 31 may have inclined surfaces on both axial sides in a cross section taken along the axial direction of the gear device 10A. The shape of the ribs 31 may be trapezoidal, triangular, rectangular, or the like in a cross section taken along the axial direction of the gear device 10A.
[0049] In the gear device 10A of this embodiment, a rib 31 is further provided on the inner surface 141 of the lid 14 in the second region 30 shaped to follow the pinion gear 12. This rib 31 faces a groove 122 formed between the gears 121a and 121b of the pinion gear 12. In this case, the lubricating oil LO is also bounced outward in the axial direction by the rib 31 on the pinion gear 12 side, just as on the gear wheel 11 side. Therefore, the gear device 10A can increase the amount of lubricating oil LO supplied to the bearings 3a and 6a.
[0050] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure.
[0051] In the above embodiment, the entire area of the inner surface 141 of the lid 14 within the range of the gear wheel 11 in the front-to-rear direction is the first area 20. However, as shown in Fig. 8, the first area 20 may be a portion of the area of the inner surface 141 of the lid 14 within the range of the gear wheel 11 in the front-to-rear direction. Even in this case, the rib 21 may be provided only in a portion of the first area 20, or may be provided in the entire first area 20.
[0052] In the example of the second embodiment described above, the ribs 21 of the first region 20 are spaced apart from the ribs 31 of the second region 30 in a cross-sectional view perpendicular to the axial direction. However, the ribs 21 may be connected to the ribs 31. In this case, the ribs 21 and 31 extend across the first region 20 and the second region 30.
[0053] In the second embodiment, the first region 20 and the second region 30 are provided continuously in the front-rear direction. However, the first region 20 and the second region 30 may be provided spaced apart in the front-rear direction. FIG. 9 is a cross-sectional view of a gear device 10A according to a modified example of the second embodiment, cut perpendicular to the axial direction. In the example of FIG. 9, a straight portion 40 is provided between the first region 20 and the second region 30 in the cross-sectional view perpendicular to the axial direction. Furthermore, as shown in FIG. 9, the second region 30 may be a partial region of the inner surface 141 of the lid 14 within the range of the pinion 12 in the front-rear direction. Even in this case, the rib 31 may be provided only in a portion of the second region 30, or may be provided over the entire second region 30. [Explanation of symbols]
[0054] 10: Gearing 1: Railway vehicles 3: Axle 6: Pinion shaft 11: Large gear 111a, 111b: Gear (first gear) 1111a, 1111b: Tooth line 112: Groove (1st groove) 12: Pinion 121a, 121b: Gear (second gear) 1211a, 1211b: Tooth line 122: Groove (2nd groove) 13: Gearbox 131: Bottom 14: Lid 141:Inside 20:First area 21: Rib 30:Second area 31: Rib
Claims
1. A gear device for a railway vehicle, comprising: a gear connected to an axle, the gear including a pair of first gears each having a plurality of tooth traces and a first groove provided between the pair of first gears, wherein the tooth trace of one of the pair of first gears and the tooth trace of the other of the pair of first gears are inclined in opposite directions to each other with respect to an axial direction of the gear; a pinion connected to a pinion gear shaft, the pinion gear including a pair of second gears each having a plurality of tooth traces and meshing with the pair of first gears, and a second groove provided between the pair of second gears, wherein the tooth trace of one of the pair of second gears and the tooth trace of the other of the pair of second gears are inclined in directions opposite to each other with respect to the axial direction; a gear box that houses the large gear and the small gear and has an opening at its top; a lid that closes the opening, a bottom portion of the gear box capable of storing lubricating oil so that at least a portion of the gear wheel is immersed therein; an inner surface of the lid has a shape that follows the gear wheel in a cross section perpendicular to the axial direction, and includes a first region in which a rib facing the first groove is provided.
2. 2. The gear device of claim 1, the inner surface of the lid further includes a second region having a shape that conforms to the pinion in a cross section perpendicular to the axial direction, and in which a rib facing the second groove is provided.
Citation Information
Patent Citations
Gear device
JP2018071607A