Railway vehicle gearbox, bogie and rail train

Abstract

The utility model provides a railway vehicle gearbox, a bogie and a railway train. The railway vehicle gearbox comprises a shell, an input shaft, an output shaft, an intermediate shaft and a transmission assembly. The input shaft is installed on the shell and is configured to rotate under the driving of an external power device. The output shaft is installed on the shell, is parallel to the input shaft and is suitable for outputting torque outwards. The intermediate shaft is arranged between the input shaft and the output shaft in parallel. The transmission assembly is arranged in the shell and comprises an input tooth part, a first output tooth part and a second output tooth part, and the input tooth part is configured to mesh the input shaft and the intermediate shaft. The first output tooth portion is configured to mesh the input tooth portion with the output shaft at a first speed ratio, and the second output tooth portion is configured to mesh the input tooth portion with the output shaft at a second speed ratio. The input tooth part is further constructed to slide in a reciprocating mode in the axial direction of the intermediate shaft so as to be selectively meshed with the first output tooth part or the second output tooth part, and therefore the speed ratio between the input tooth part and the output shaft is switched.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicles, and more specifically, to a rail vehicle gearbox, a bogie and a rail vehicle. Background Art

[0002] As a key transmission device, rail vehicle gearboxes play a vital role in the field of railway transportation. With the rapid development of rail transportation, the technical requirements for rail vehicle gearboxes are also increasing.

[0003] In rail transportation, different tracks typically have different speed ratings, and rail vehicles traveling on these tracks must maintain speeds that match the speed ratings of those tracks. Furthermore, because traction power is influenced by both traction and speed, a rail vehicle traveling on a long slope using only a fixed gear ratio will not be able to achieve maximum traction power. Even at maximum traction power, there may still be situations where speed or traction power are insufficient to meet the vehicle's travel requirements.

[0004] In the prior art, rail vehicle transmissions are typically designed with two gear ratios: a high-speed ratio and a low-speed ratio, to meet varying driving requirements. For example, a commonly used single-stage transmission utilizes gears and bearings of varying specifications arranged on the input shaft, with shifting performed via a shift mechanism. This results in a compact design and high transmission efficiency. However, this approach requires a large number of bearings on the input shaft, resulting in a complex structure that is difficult to maintain and repair, and requires more precise control during the shifting process. Therefore, optimizing the transmission's internal structure to better meet driving requirements has become a pressing technical challenge. Utility Model Content

[0005] In view of this, the utility model provides a rail vehicle gearbox that can adapt to driving requirements under different road conditions and has a more reasonable internal layout.

[0006] One aspect of the present invention provides a rail vehicle gearbox, comprising: a housing; an input shaft mounted on the housing and configured to rotate under the drive of an external power device; an output shaft mounted on the housing, arranged in parallel with the input shaft, and suitable for outputting torque to the outside; an intermediate shaft arranged in parallel between the input shaft and the output shaft; a transmission assembly arranged in the housing, comprising: an input tooth portion configured to mesh the input shaft with the intermediate shaft; a first output tooth portion configured to mesh the input tooth portion with the output shaft at a first speed ratio; and a second output tooth portion configured to mesh the input tooth portion with the output shaft at a second speed ratio; wherein the input tooth portion is further configured to slide back and forth along the axial direction of the intermediate shaft to selectively mesh with the first output tooth portion or the second output tooth portion to switch the speed ratio between the input tooth portion and the output shaft.

[0007] According to an embodiment of the present invention, the input tooth portion includes: a driving input gear mounted on the input shaft; a driven input gear mounted on the intermediate shaft and meshing with the driving input gear, the driven input gear being configured to drive the intermediate shaft to rotate and slide relative to the intermediate shaft in the axial direction, so that the driven input gear selectively meshes with the first output tooth portion or the second output tooth portion.

[0008] According to an embodiment of the present invention, the above-mentioned driven input gear includes: an inner gear, which is installed on the above-mentioned intermediate shaft through a spline, and the outer walls of both ends of the above-mentioned inner gear are formed with teeth, which are configured to respond to the above-mentioned inner gear sliding along the above-mentioned axial direction to selectively engage with the above-mentioned first output tooth portion or the above-mentioned second output tooth portion; an outer gear, which is sleeved on the middle part of the above-mentioned inner gear and is suitable for engaging with the above-mentioned active input gear.

[0009] According to an embodiment of the present invention, the first output tooth portion includes: a first driving gear mounted on the intermediate shaft, the inner surface of the first driving gear being formed with first internal teeth that mesh with the tooth portion adjacent to the first driving gear; a first driven gear mounted on the output shaft and meshing with the first driving gear to drive the output shaft to rotate at the first speed ratio.

[0010] According to an embodiment of the present invention, the second output tooth portion includes: a second driving gear mounted on the intermediate shaft, the inner surface of the second driving gear being formed with second internal teeth that mesh with the tooth portion near the second driving gear; a second driven gear mounted on the output shaft and meshing with the second driving gear to drive the output shaft to rotate at the second speed ratio.

[0011] According to an embodiment of the present invention, a shift mechanism is further included, which is installed in the above-mentioned housing and is suitable for driving the above-mentioned driven input gear to slide back and forth along the above-mentioned axial direction.

[0012] According to an embodiment of the present invention, the shift mechanism includes: a driving portion; a shift fork connected to the driving portion and adapted to reciprocate along the axial direction under the drive of the driving portion to shift the driven input gear.

[0013] According to an embodiment of the present invention, a flange extending in a circumferential direction is formed on the end surface of the outer gear, and the shift fork shifts the driven input gear via the flange.

[0014] According to an embodiment of the present invention, the first driving gear is mounted on the intermediate shaft via a pair of tapered roller bearings.

[0015] According to an embodiment of the present invention, the second driving gear is mounted on the intermediate shaft via a pair of tapered roller bearings.

[0016] According to an embodiment of the present invention, the above-mentioned shell includes an upper shell and a lower shell, and the above-mentioned upper shell is buckled onto the above-mentioned lower shell along a first direction perpendicular to the above-mentioned axial direction to define an accommodating space, and the above-mentioned accommodating space is suitable for accommodating the above-mentioned input shaft, the above-mentioned output shaft, the above-mentioned intermediate shaft and the above-mentioned transmission assembly.

[0017] Another aspect of the present invention provides a bogie, comprising: a frame; a rail vehicle gearbox as in any of the above embodiments, suspended below the frame; an external power device connected to the input shaft of the rail vehicle gearbox; and a wheelset connected to the output shaft of the rail vehicle gearbox.

[0018] Another aspect of the present invention provides a rail train, comprising: a car body; and a bogie as described in any of the above embodiments, installed at the bottom of the car body.

[0019] The rail vehicle transmission provided by this utility model transmits the torque of the external power unit to the intermediate shaft via the input gear. The intermediate shaft rotates synchronously with the input gear. As the input gear slides axially, it engages with the first or second output gear, transferring the torque to the output shaft. This enables speed ratio switching between the input and output shafts, adapting to driving conditions under varying road conditions. The intermediate shaft provides a two-stage transmission, providing more flexibility for adjusting the transmission's overall transmission ratio. Furthermore, placing the speed ratio switching action on the intermediate shaft simplifies the layout of the input shaft, reduces the impact of shift shock on the input shaft, and improves overall transmission space utilization and a more rational layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0021] Figure 1 This is an overall schematic diagram of the rail vehicle gearbox provided by the utility model;

[0022] Figure 2 yes Figure 1 A schematic diagram of the disassembled housing in the exemplary embodiment shown;

[0023] Figure 3 yes Figure 1 The overall schematic diagram of the exemplary embodiment shown with the housing removed;

[0024] Figure 4 yes Figure 1 A cross-sectional view taken along line AA of the illustrated exemplary embodiment;

[0025] Figure 5 yes Figure 3 An exploded schematic diagram of the driven input gear in the exemplary embodiment shown, showing both the first driving gear and the second driving gear;

[0026] Figure 6 yes Figure 3 The illustrated exemplary embodiment is a schematic diagram with the first driven gear, the second driven gear, and the output shaft removed.

[0027] In the drawings, the meanings of the reference numerals are as follows:

[0028] 1. Input shaft;

[0029] 2. Output shaft;

[0030] 3. Intermediate shaft;

[0031] 4. Shell;

[0032] 41. Upper shell;

[0033] 42. Lower housing;

[0034] 5. Input gear;

[0035] 51. Active input gear;

[0036] 52. Driven input gear;

[0037] 521, inner gear;

[0038] 5211, tooth;

[0039] 522, outer gear;

[0040] 5221, flange;

[0041] 6. First output gear;

[0042] 61. First driving gear;

[0043] 611, first internal tooth;

[0044] 62. First driven gear;

[0045] 7. Second output gear;

[0046] 71. Second driving gear;

[0047] 711, second inner tooth;

[0048] 72. Second driven gear;

[0049] 8. Gear shifting mechanism;

[0050] 81. Driving unit;

[0051] 82. Fork. DETAILED DESCRIPTION

[0052] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion in the concepts of the present invention.

[0053] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the presence of the features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0054] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0055] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0056] Figure 1 This is an overall schematic diagram of the rail vehicle gearbox provided by the utility model. Figure 2 yes Figure 1 A schematic diagram of the disassembled housing in the exemplary embodiment shown, Figure 3 yes Figure 1 The overall schematic diagram of the exemplary embodiment shown with the housing removed, Figure 4 yes Figure 1 A cross-sectional view taken along line AA of the exemplary embodiment shown.

[0057] The exemplary embodiment of the present utility model provides a rail vehicle gearbox, such as Figures 1-4 As shown, the transmission assembly comprises a housing 4, an input shaft 1, an output shaft 2, an intermediate shaft 3, and a transmission assembly. The input shaft 1 is mounted on the housing 4 and is configured to rotate when driven by an external power device. The output shaft 2 is mounted on the housing 4, arranged parallel to the input shaft 1, and is suitable for outputting torque to an external device. The intermediate shaft 3 is arranged parallel to and between the input shaft 1 and the output shaft 2. The transmission assembly is arranged within the housing 4 and includes an input gear 5, a first output gear 6, and a second output gear 7. The input gear 5 is configured to mesh with the input shaft 1 and the intermediate shaft 3. The first output gear 6 is configured to mesh with the output shaft 2 at a first speed ratio, and the second output gear 7 is configured to mesh with the output shaft 2 at a second speed ratio. The input gear 5 is also configured to reciprocate along the axial direction of the intermediate shaft 3 to selectively mesh with the first output gear 6 or the second output gear 7 to switch the speed ratio between the input gear 5 and the output shaft 2.

[0058] In this embodiment, input shaft 1 transmits the torque of the external power unit to intermediate shaft 3 via input gear 5. Input gear 5 is axially slidable. When input gear 5 slides to engage with first output gear 6, the torque on intermediate shaft 3 is transmitted to output shaft 2 at a first speed ratio. When input gear 5 slides to engage with second output gear 6, the torque on intermediate shaft 3 is transmitted to output shaft 2 at a second speed ratio, and ultimately output by output shaft 2. By providing intermediate shaft 3 with two-stage torque transmission, the meshing between intermediate shaft 3 and input shaft 2 provides an additional adjustable parameter for the design of the transmission's overall transmission ratio. Furthermore, placing the speed ratio shifting action on intermediate shaft 3 simplifies the structural complexity of input shaft 1, effectively reducing shift shock on input shaft 1 and improving the uniformity of component layout throughout the transmission.

[0059] In an exemplary embodiment, the input gear portion 5 includes a driving input gear 51 and a driven input gear 52. The driving input gear 51 is mounted on the input shaft 1 and rotates synchronously with the input shaft 1. The driven input gear 52 is mounted on the intermediate shaft 3 and meshes with the driving input gear 51. The driven input gear 52 is configured to drive the intermediate shaft 3 in rotation and slide axially relative to the intermediate shaft 3, so that the driven input gear 52 selectively meshes with the first output gear portion 6 or the second output gear portion 7.

[0060] In this embodiment, the driving input gear 51 is mounted in the middle of the input shaft 1, and the corresponding driven input gear 52 is mounted in the middle of the intermediate shaft 3, driving the intermediate shaft 3 to rotate and transmit torque. When the driven input gear 52 slides axially toward the ends of the intermediate shaft 3, it meshes with the first output tooth portion 6 or the second output tooth portion 7, respectively, thereby transmitting torque to the output shaft 2 at the first speed ratio or the second speed ratio.

[0061] Figure 5 yes Figure 3 An exploded schematic diagram of the driven input gear in the exemplary embodiment shown, showing both the first driving gear and the second driving gear, Figure 6 yes Figure 3 The illustrated exemplary embodiment is a schematic diagram with the first driven gear, the second driven gear, and the output shaft removed.

[0062] According to the embodiment of the present utility model, Figure 5 As shown, the driven input gear 52 includes an inner gear 521 and an outer gear 522. The inner gear 521 is mounted on the intermediate shaft 3 via a spline. A tooth portion 5211 is formed on the outer wall of each end of the inner gear 521. The tooth portion 5211 is configured to selectively engage with the first output tooth portion 6 or the second output tooth portion 7 in response to the inner gear 521 sliding in the axial direction. The outer gear 522 is sleeved around the middle of the inner gear 521 and is suitable for engaging with the driving input gear 51.

[0063] In this embodiment, the inner gear 521 is mounted on the intermediate shaft 3 via a spline, allowing it to rotate the intermediate shaft 3 while sliding axially relative to the intermediate shaft 3. The outer gear 522 is mounted on the center of the inner gear 521 via a connecting key, maintaining synchronous movement with the inner gear 521. During operation, the outer gear 522 meshes with the driving input gear 51 to receive torque from the input shaft 1. The teeth 5211 of the inner gear 521 mesh with the first output teeth 6 or the second output teeth 7 to transmit torque to the output shaft 3.

[0064] It should be noted that, taking the shift from the first to the second speed ratio as an example, as the inner gear 521 and outer gear 522 synchronously slide toward the second output tooth portion 7, the tooth portion 5211 at the other end must be disengaged from the first output tooth portion 6 before engaging with the second output tooth portion 7 to avoid damage to the gears or shaft. Furthermore, the width of the inner gear 521 must ensure that it remains engaged with the active input gear 51 during the sliding process.

[0065] In an exemplary embodiment, Figure 3-Figure 6 As shown, the first output gear portion 6 includes a first driving gear 61 and a first driven gear 62. The first driving gear 61 is mounted on the intermediate shaft 3 and has first internal teeth 611 formed on its inner surface, which mesh with the teeth portion 5211 adjacent to the first driving gear 61. The first driven gear 62 is mounted on the output shaft 2 and meshes with the first driving gear 61 to drive the output shaft 2 to rotate at the first speed ratio.

[0066] In such an embodiment, the first driving gear 61 has external teeth and first internal teeth 611 . The first internal teeth 611 mesh with the inner gear 521 , and the external teeth mesh with the first driven gear 62 to transmit torque to the output shaft 2 .

[0067] Similar, such as Figure 3-Figure 6 As shown, the second output gear portion 7 includes a second driving gear 71 and a second driven gear 72. The second driving gear 71 is mounted on the intermediate shaft 3 and has a second internal tooth 711 formed on its inner surface, which meshes with the tooth portion 5211 adjacent to the second driving gear 71. The second driven gear 72 is mounted on the output shaft 2 and meshes with the second driving gear 71 to drive the output shaft 2 to rotate at the second speed ratio.

[0068] In this embodiment, the second driving gear 71 has external teeth and second internal teeth 711 . The second internal teeth 711 mesh with the inner gear 521 , and the external teeth mesh with the second driven gear 72 to transmit torque to the output shaft 2 .

[0069] Optionally, the tooth ratio of the first internal teeth 611 of the first driving gear 61 to the tooth portion 5211 is 66 / 35, and when combined with the input tooth portion 5, the total speed ratio is 3.85; the tooth ratio of the second internal teeth 711 of the second driving gear 71 to the tooth portion 5211 is 71 / 30, and when combined with the input tooth portion 5, the total speed ratio is 4.83.

[0070] In an exemplary embodiment, Figure 6 As shown, the rail vehicle gearbox further includes a shift mechanism 8 installed in the housing 4 and adapted to drive the driven input gear 52 to slide back and forth in the circumferential direction.

[0071] According to an embodiment of the present invention, the shift mechanism 8 includes a driving portion 81 and a shift fork 82. The shift fork 82 is connected to the driving portion 81 and is adapted to reciprocate in the axial direction under the drive of the driving portion 81 to shift the driven input gear 52.

[0072] In such an embodiment, the output stroke of the driving portion 81 is adapted to the spacing between the first output tooth portion 6 and the second output tooth portion 7, and the width of the driven input gear 52. More specifically, the driving portion 81 can be provided with a plurality of output strokes, for example, two or three, as the first speed ratio gear, the second speed ratio gear and the neutral gear.

[0073] In the embodiment of the present invention, the driving unit 81 is only provided with two output strokes and no neutral position is provided, which can shorten the shifting time and improve the shifting speed and the continuity of torque transmission.

[0074] In an exemplary embodiment, the driving portion 81 includes but is not limited to a cylinder.

[0075] According to an embodiment of the present invention, a flange 5221 extending in the circumferential direction is formed on the end surface of the outer gear 522 , and the shift fork 82 shifts the driven input gear 52 via the flange 5221 .

[0076] In such an embodiment, Figure 6 As shown, the flange 5221 is a sheet-like annular component extending from the end surface of the outer gear 522 in the circumferential direction, and the shift fork 82 is a Y-shaped component, which can shift the driven input gear 52 under the drive of the driving part 81 after clamping the flange 5221.

[0077] In an exemplary embodiment, the first driving gear 61, the first driven gear 62, the second driving gear 71 and the second driven gear 72 are all helical gears, which have less impact and vibration during the transmission process, can reduce energy loss, and have a certain axial load-bearing capacity to bear the axial impact caused by shifting.

[0078] In an exemplary embodiment, the first driving gear 61 is mounted on the intermediate shaft 3 via a pair of tapered roller bearings.

[0079] In an exemplary embodiment, the second driving gear 71 is mounted on the intermediate shaft 3 via a pair of tapered roller bearings.

[0080] In this embodiment, each pair of tapered roller bearings is arranged back-to-back, such as "><". The tapered roller bearings can bear higher axial loads, further improving the reliability of the first driving gear 61 and the second driving gear 71 and preventing axial movement during gear shifting.

[0081] In some other exemplary embodiments, the input shaft 1 bears a relatively small axial load and is mounted on the bearing seat of the housing 4 using a cylindrical roller bearing with a rib. More specifically, both the input shaft 1 and the intermediate shaft 3 are mounted using NJ bearings, which facilitate installation and help reduce axial width. The output shaft 2 bears a relatively large axial load and is mounted between opposite sides of the housing 4 using a pair of tapered roller bearings.

[0082] In an exemplary embodiment, the housing 4 includes an upper housing 41 and a lower housing 42, and the upper housing 41 is snapped onto the lower housing 42 along a first direction perpendicular to the axial direction to define an accommodating space suitable for accommodating the input shaft 1, the output shaft 2, the intermediate shaft 3 and the transmission assembly.

[0083] In this embodiment, since only a two-stage transmission of the input shaft 1, the output shaft 2 and the intermediate shaft 3 is used, there are more gears and shafts inside the gearbox, and a split housing 4 is easier to assemble and later maintain.

[0084] An embodiment of the present invention further provides a bogie comprising a frame, a rail vehicle transmission according to any of the above embodiments, an external power unit, and a wheelset. The rail vehicle transmission is suspended below the frame, the external power unit is connected to an input shaft 1 of the rail vehicle transmission, and the wheelset is connected to an output shaft 2 of the rail vehicle transmission.

[0085] An embodiment of the present invention further provides a rail train, comprising a car body and the bogie in the above embodiment, wherein the bogie is installed at the bottom of the car body.

[0086] Those skilled in the art will appreciate that the features described in the various embodiments of the present invention may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in the present invention. In particular, the features described in the various embodiments of the present invention may be combined and / or coupled in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or couplings fall within the scope of the present invention.

[0087] The above describes embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although each embodiment has been described separately, this does not mean that the measures in each embodiment cannot be advantageously combined. Those skilled in the art may make various substitutions and modifications without departing from the scope of the present invention, and such substitutions and modifications are intended to fall within the scope of the present invention.

Claims

1. A rail vehicle gearbox, characterized in that: include: housing (4); An input shaft (1) is mounted on the housing (4) and is configured to rotate when driven by an external power device; An output shaft (2) is mounted on the housing (4), arranged in parallel with the input shaft (1), and is suitable for outputting torque to the outside; an intermediate shaft (3) arranged in parallel between the input shaft (1) and the output shaft (2); The transmission assembly is arranged in the housing (4) and comprises: An input tooth portion (5) configured to mesh the input shaft (1) with the intermediate shaft (3); a first output tooth portion (6) configured to mesh the input tooth portion (5) with the output shaft (2) at a first speed ratio; A second output tooth portion (7) is configured to engage the input tooth portion (5) with the output shaft (2) at a second speed ratio; wherein the input tooth portion (5) is further configured to slide back and forth along the axial direction of the intermediate shaft (3) to selectively engage with the first output tooth portion (6) or the second output tooth portion (7) to switch the speed ratio between the input tooth portion (5) and the output shaft (2).

2. The rail vehicle gearbox according to claim 1, characterized in that: The input tooth portion (5) comprises: A driving input gear (51) mounted on the input shaft (1); A driven input gear (52) is mounted on the intermediate shaft (3) and meshes with the driving input gear (51), and is configured to drive the intermediate shaft (3) to rotate and slide relative to the intermediate shaft (3) along the axial direction, so that the driven input gear (52) selectively meshes with the first output tooth portion (6) or the second output tooth portion (7).

3. The rail vehicle gearbox according to claim 2, characterized in that: The driven input gear (52) comprises: an inner gear (521) mounted on the intermediate shaft (3) via a spline, wherein outer walls of both ends of the inner gear (521) are formed with tooth portions (5211), and are configured to selectively mesh with the first output tooth portion (6) or the second output tooth portion (7) in response to the inner gear (521) sliding along the axial direction; The outer gear (522) is sleeved on the middle portion of the inner gear (521) and is suitable for meshing with the active input gear (51).

4. The rail vehicle gearbox according to claim 3, characterized in that: The first output tooth portion (6) comprises: A first driving gear (61) is mounted on the intermediate shaft (3), wherein the inner surface of the first driving gear (61) is formed with first internal teeth (611) that mesh with the tooth portion (5211) adjacent to the first driving gear (61); A first driven gear (62) is mounted on the output shaft (2) and meshes with the first driving gear (61) to drive the output shaft (2) to rotate at a first speed ratio.

5. The rail vehicle gearbox according to claim 3, characterized in that: The second output tooth portion (7) comprises: a second driving gear (71) mounted on the intermediate shaft (3); a second inner tooth (711) formed on the inner surface of the second driving gear (71) and meshing with the tooth portion (5211) adjacent to the second driving gear (71); A second driven gear (72) is mounted on the output shaft (2) and meshes with the second driving gear (71) to drive the output shaft (2) to rotate at a second speed ratio.

6. The rail vehicle gearbox according to any one of claims 3 to 5, characterized in that: It also includes a shift mechanism (8) installed in the housing (4) and suitable for driving the driven input gear (52) to slide back and forth along the axial direction.

7. The rail vehicle gearbox according to claim 6, characterized in that: The shift mechanism (8) comprises: Driving unit (81); A shift fork (82) is connected to the driving portion (81) and is adapted to reciprocate along the axial direction under the drive of the driving portion (81) to shift the driven input gear (52).

8. The rail vehicle gearbox according to claim 7, characterized in that: A flange (5221) extending in the circumferential direction is formed on the end surface of the outer gear (522), and the shift fork (82) shifts the driven input gear (52) via the flange (5221).

9. The rail vehicle gearbox according to claim 4, characterized in that: The first driving gear (61) is mounted on the intermediate shaft (3) via a pair of tapered roller bearings.

10. The rail vehicle gearbox according to claim 5, characterized in that: The second driving gear (71) is mounted on the intermediate shaft (3) via a pair of tapered roller bearings.

11. The rail vehicle gearbox according to claim 1, characterized in that: The housing (4) comprises an upper housing (41) and a lower housing (42), wherein the upper housing (41) is fastened to the lower housing (42) along a first direction perpendicular to the axial direction to define an accommodating space, wherein the accommodating space is suitable for accommodating the input shaft (1), the output shaft (2), the intermediate shaft (3) and the transmission assembly.

12. A bogie, characterized in that: include: framework; The rail vehicle gearbox according to any one of claims 1 to 11, suspended below the frame; An external power device connected to the input shaft (1) of the gearbox of the rail vehicle; A wheelset is connected to the output shaft (2) of the rail vehicle gearbox.

13. A rail train, characterized in that: include: vehicle body; The bogie according to claim 12 is mounted on the bottom of the vehicle body.

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