A neutral locking device for an axle gearbox

Abstract

This invention provides a neutral locking device for an axle gearbox, belonging to the field of gearbox control technology. The device includes: a guide seat, which can be connected to the axle gearbox of a screen cleaning machine; an extension rod, slidably connected to the guide seat, one end of which can penetrate into the axle gearbox and connect to one end of a shift fork rod inside the axle gearbox; a limiting mechanism, connected to the guide seat, which can limit the sliding of the extension rod relative to the guide seat; and an operating mechanism, including a flexible shaft locking controller and a flexible shaft. The flexible shaft locking controller can be connected to the bogie of the screen cleaning machine. The operator only needs to operate the flexible shaft locking controller on the bogie to lock or unlock the shift fork rod, eliminating the need for the operator to crawl to the bottom of the screen cleaning machine, thus improving operator safety.

Description

Technical Field

[0001] This invention belongs to the field of gearbox control technology, and more specifically, relates to a neutral locking device for an axle gearbox. Background Technology

[0002] The axle gearbox is the final drive unit of the slope cleaning screen machine's transmission system. Fixed to the bogie, it drives the wheelsets to propel the machine. This gearbox has three gears: high-speed self-propelled, low-speed working, and neutral (no-fire return). To ensure the reliability of the no-fire return, when the screen machine needs to switch to neutral or from neutral to other gears, the operator must crawl under the machine to insert and remove a pin. This pin locks or unlocks the shift fork lever inside the gearbox. However, due to the confined space around the axle gearbox, this poses a safety hazard for personnel crawling under the screen machine to insert and remove the pin. Summary of the Invention

[0003] The purpose of this invention is to provide a neutral locking device for axle gearbox to address the shortcomings of existing technologies, thereby solving the safety hazard mentioned in the background art where personnel have to crawl under the screen cleaning machine to insert or remove the pin due to the limited space around the axle gearbox.

[0004] To achieve the above objectives, the present invention provides a neutral locking device for an axle gearbox, the device comprising:

[0005] A guide seat, which can be connected to the axle gearbox of the screen cleaning machine;

[0006] An extension rod is slidably connected to the guide seat, and one end of the extension rod can penetrate into the axle gearbox and be connected to one end of the shift fork rod inside the axle gearbox;

[0007] A limiting mechanism is connected to the guide seat, and the limiting mechanism can restrict the extension rod from sliding relative to the guide seat;

[0008] The operating mechanism includes a flexible shaft locking controller and a flexible shaft. The flexible shaft locking controller can be connected to the bogie of the screen cleaning machine. The two ends of the flexible shaft are respectively connected to the flexible shaft locking controller and the limiting mechanism. When the shift fork is adjusted to the neutral position of the axle gearbox, the flexible shaft locking controller can control the limiting mechanism to restrict the extension rod from sliding relative to the guide seat under the transmission action of the flexible shaft.

[0009] Preferably, the guide seat includes:

[0010] Dominant direction;

[0011] A connecting plate, one side of which is connected to one end of the main guide sleeve, the connecting plate having an installation port, and the other side of which can be connected to the axle gearbox.

[0012] An end plate, one side of which is connected to the other end of the main guide sleeve, is provided with a first sliding hole, and the extension rod passes through the first sliding hole, the main guide sleeve and the mounting port in sequence.

[0013] Preferably, the limiting mechanism includes:

[0014] The extension rod has an annular groove on its rod wall inside the main guide sleeve;

[0015] Connection ports are provided on both opposite side walls of the main guide sleeve;

[0016] A secondary guide sleeve is disposed inside the primary guide sleeve. The two ends of the secondary guide sleeve are respectively connected to the two connecting ports. The side wall of the secondary guide sleeve is provided with a notch, and the extension rod is slidably connected in the notch.

[0017] A pin is provided, one end of which is connected to one end of the flexible shaft. The pin is slidably connected within the secondary guide sleeve. When the shift fork is adjusted to the neutral position of the axle gearbox, the annular groove slides to the position of the recess. The flexible shaft locking controller can control the pin to insert into the annular groove under the transmission action of the flexible shaft.

[0018] Preferably, the device further includes:

[0019] The end plate is provided with a guide hole that communicates with the other port of the main guide sleeve;

[0020] A guide copper sleeve, which is fitted inside the guide hole;

[0021] An anti-rotation rod, which passes through and is slidably connected within the guide copper sleeve;

[0022] The linkage plate has its two ends fixedly connected to the anti-rotation rod and the extension rod, respectively.

[0023] Preferably, the device further includes:

[0024] A plug is fitted inside the mounting opening. The plug has a second sliding hole, through which the extension rod passes. One end of the plug can pass through and be mounted on the axle gearbox.

[0025] Preferably, the device further includes an adjusting shim, which is pressed between the guide seat and the axle gearbox.

[0026] Preferably, the linkage plate is provided with two linkage holes;

[0027] The anti-rotation rod is provided with a screw at one end outside the main guide sleeve, one of the linkage holes is sleeved on the screw, and a nut is threaded on the screw;

[0028] The extension rod has an internal threaded hole at one end located outside the axle gearbox, and the bolt passes through another linkage hole and is threaded into the internal threaded hole.

[0029] Preferably, the end of the plug located inside the main guide sleeve is provided with a shaft seal mounting groove communicating with the second sliding hole. The device also includes a shaft seal and a shaft seal retaining ring. The shaft seal is disposed in the shaft seal mounting groove and sleeved on the extension rod. The shaft seal retaining ring is disposed in the shaft seal mounting groove and fixed to the side of the shaft seal away from the second sliding hole.

[0030] Preferably, the guide seat further includes a mounting plate, which is used to be disposed between the axle gearbox and the connecting plate. The plug has an external threaded wall on its outer side, and the plug can be threadedly connected to the axle gearbox and is used to press the mounting plate against the outer wall of the axle gearbox.

[0031] Preferably, the limiting mechanism further includes a support base, which can be connected to the axle gearbox, one end of the outer sleeve of the flexible shaft is fixed to the support base, and one end of the inner core of the flexible shaft is connected to one end of the pin.

[0032] This invention provides a neutral locking device for an axle gearbox. Its advantages are as follows: the guide seat of the device is connected to the axle gearbox, the limiting mechanism is connected to the guide seat, and the flexible shaft locking controller is connected to the bogie of the screen cleaning machine. The flexible shaft locking controller and the limiting mechanism are connected via a flexible shaft. When the shift fork lever is adjusted to the neutral position of the axle gearbox, the extension rod will simultaneously slide to a predetermined position on the guide seat. The operator can operate the flexible shaft locking controller, and under the transmission action of the flexible shaft, control the limiting mechanism to lock the extension rod, preventing the extension rod from sliding and thus preventing the shift fork from slipping. The movement of the lever allows the operator to adjust the shift fork lever from neutral to a high-speed or low-speed position of the axle gearbox. The operator can then operate the flexible shaft locking controller again, and under the transmission action of the flexible shaft, control the limit mechanism to unlock the extension rod's sliding. This prevents the axle gearbox from switching from neutral to other gears in neutral, improving the reliability of the axle gearbox. Furthermore, the operator only needs to operate the flexible shaft locking controller on the bogie to lock or unlock the shift fork lever, eliminating the need to crawl to the bottom of the screen cleaning machine and improving operator safety.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0035] Figure 1 A front view schematic diagram of a neutral locking device for an axle gearbox according to an embodiment of the present invention is shown;

[0036] Figure 2 A cross-sectional schematic diagram of a neutral locking device for an axle gearbox according to an embodiment of the present invention is shown.

[0037] Figure 3 A top view schematic diagram of a flexible shaft locking controller for a neutral gearbox according to an embodiment of the present invention is shown.

[0038] Figure 4 A top view of the guide seat structure of a neutral locking device for an axle gearbox according to an embodiment of the present invention is shown;

[0039] Figure 5 A cross-sectional view of a guide seat for a neutral gearbox according to an embodiment of the present invention is shown.

[0040] Figure 6 A cross-sectional schematic diagram of the extension rod portion of a neutral locking device for an axle gearbox according to an embodiment of the present invention is shown.

[0041] Figure 7 A schematic cross-sectional view of a plug for a neutral gearbox according to an embodiment of the present invention is shown.

[0042] Figure 8 A cross-sectional schematic diagram of the main guide sleeve and the secondary guide sleeve of a neutral locking device for an axle gearbox according to an embodiment of the present invention is shown.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Axle gearbox; 2. Guide seat; 3. Extension rod; 4. Flexible shaft locking controller; 5. Bogie; 6. Flexible shaft; 7. Main guide sleeve; 8. Connecting plate; 9. End plate; 10. Annular groove; 11. Secondary guide sleeve; 12. Notch; 13. Pin; 14. Guide copper sleeve; 15. Anti-rotation rod; 16. Linkage plate; 17. Plug; 18. Adjusting shim; 19. Screw; 20. Nut; 21. Internal threaded hole; 22. Bolt; 23. Shaft seal; 24. Shaft seal retaining ring; 25. Support seat; 26. Mounting plate; 27. Threaded connecting rod. Detailed Implementation

[0045] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0046] like Figure 1-4 As shown, the present invention provides a neutral locking device for an axle gearbox, the device comprising:

[0047] Guide seat 2, guide seat 2 can be connected to the axle gearbox 1 of the screen cleaning machine;

[0048] Extension rod 3 is slidably connected to guide seat 2. One end of extension rod 3 can penetrate into axle gearbox 1 and is connected to one end of shift fork rod in axle gearbox 1.

[0049] A limiting mechanism is connected to the guide seat 2, and the limiting mechanism can restrict the extension rod 3 from sliding relative to the guide seat 2;

[0050] The operating mechanism includes a flexible shaft locking controller 4 and a flexible shaft 6. The flexible shaft locking controller 4 can be connected to the bogie 5 of the screen cleaning machine. The two ends of the flexible shaft 6 are respectively connected to the flexible shaft locking controller 4 and the limiting mechanism. When the shift fork is adjusted to the neutral position of the axle gearbox 1, the flexible shaft locking controller 4 can control the limiting mechanism to restrict the extension rod 3 from sliding relative to the guide seat under the transmission action of the flexible shaft 6.

[0051] Specifically, to address the issue of operators needing to crawl under the vehicle to insert and remove pins when switching the screen cleaning machine to neutral or other gears, thereby locking or unlocking the shift fork lever inside the gearbox, the present invention provides a neutral locking device for the axle gearbox. The screen cleaning machine is a slope screen cleaning machine, a large railway maintenance machine used for excavating and treating ballast on both sides of the railway tracks. The axle gearbox 1 is a device that transmits motion and power through a gear pair. The shift fork lever is an actuating component used for clutch shifting. The extension rod 3 can be made of 40Cr steel. When the shift fork lever is adjusted to the neutral position of the axle gearbox 1, the extension rod 3 will simultaneously slide on the guide seat 2. Once the machine is moved to the predetermined position, the operator can operate the flexible shaft locking controller 4, and under the transmission action of the flexible shaft 6, control the limit mechanism to lock the extension rod 3, preventing the extension rod 3 from sliding and thus preventing the movement of the shift fork lever. When the shift fork lever needs to be adjusted from neutral to high speed or low speed in the axle gearbox 1, the operator can operate the flexible shaft locking controller 4 again, and under the transmission action of the flexible shaft 6, control the limit mechanism to unlock the extension rod 3 from sliding. Thus, in neutral, the axle gearbox 1 can be prevented from switching from neutral to other gears, improving the reliability of the axle gearbox 1. Therefore, the operator only needs to operate the flexible shaft locking controller 4 on the bogie 5 to lock or unlock the shift fork lever. The operator does not need to crawl to the bottom of the screen cleaning machine to operate, improving the safety of the operator.

[0052] The flexible shaft locking controller 4 is existing technology and is generally used in conjunction with the flexible shaft 6. The operator only needs to swing the handle of the flexible shaft locking controller 4 left and right to control the limit mechanism under the transmission action of the flexible shaft 6, so as to lock or unlock the shift fork lever.

[0053] like Figure 2 and Figure 5 As shown, preferably, the guide seat includes:

[0054] Dominant towards set 7;

[0055] The connecting plate 8 has one side connected to one end of the main guide sleeve 7, and the connecting plate 8 has an installation port. The other side of the connecting plate 8 can be connected to the axle gearbox 1.

[0056] End plate 9, one side of end plate 9 is connected to the other end of main guide sleeve 7, end plate 9 is provided with a first sliding hole, and extension rod 3 passes through the first sliding hole, main guide sleeve 7 and mounting port in sequence.

[0057] Specifically, the connecting plate 8, the main guide sleeve 7, and the end plate 9 can be welded together in sequence to provide support and guidance for the extension rod 3.

[0058] like Figure 2, Figure 4 , Figure 5 and Figure 8 As shown, preferably, the limiting mechanism includes:

[0059] The extension rod 3 has an annular groove 10 on the rod wall inside the main guide sleeve 7;

[0060] Connection ports are provided on both sides of the main sleeve 7;

[0061] A secondary guide sleeve 11 is provided inside the main guide sleeve 7. The two ends of the secondary guide sleeve 11 are connected to the two connecting ports respectively. The side wall of the secondary guide sleeve 11 is provided with a notch 12, and the extension rod 3 is slidably connected in the notch 12.

[0062] Pin 13, one end of pin 13 is connected to one end of flexible shaft 6. Pin 13 is slidably connected in secondary guide sleeve 11. When shift fork is adjusted to the neutral position of axle gearbox 1, annular groove 10 slides to the position of recess 12. Flexible shaft locking controller 4 can control pin 13 to be inserted into annular groove 10 under the transmission action of flexible shaft 6.

[0063] Specifically, when the shift fork lever is adjusted to the neutral position of the axle gearbox 1, the annular groove 10 slides to the position of the recess 12. When it is necessary to lock the shift fork lever, the operator only needs to operate the handle of the flexible shaft locking controller 4, which will control the pin 13 to be inserted into the annular groove 10 under the transmission action of the flexible shaft 6. In this way, the sliding of the extension rod 3 can be restricted, thereby limiting the movement of the shift fork lever.

[0064] Preferably, the device further includes:

[0065] The end plate 9 is provided with a guide hole that communicates with the other end of the main guide sleeve 7;

[0066] Guide copper sleeve 14, the guide copper sleeve 14 is sleeved on the inside of the guide hole;

[0067] Anti-rotation rod 15, which is slidably connected to guide copper sleeve 14;

[0068] Linkage plate 16, with its two ends fixedly connected to anti-rotation rod 15 and extension rod 3 respectively.

[0069] Specifically, the linkage plate 16 connects the anti-rotation rod 15 and the extension rod 3. When the extension rod 3 slides, the anti-rotation rod 15 will also slide at the same time to prevent the extension rod 3 from rotating under force when the pin 13 is inserted into the annular groove 10.

[0070] Preferably, one end of the extension rod 3 is provided with a threaded connecting rod 27, and one end of the shift fork is provided with a threaded connecting hole, and the threaded connecting rod 27 is threadedly connected in the threaded connecting hole.

[0071] Specifically, by limiting the rotation of the anti-rotation rod 15, the extension rod 3 is prevented from rotating under force, and the threaded connection between the extension rod 3 and the shift fork rod is also prevented from loosening.

[0072] Preferably, one end of the guide copper sleeve 14 is provided with a flange, which is attached to one side of the end plate 9. A copper sleeve retaining ring is sleeved and fixed to the outside of the guide copper sleeve 14, and the copper sleeve retaining ring is attached to the other side of the end plate 9.

[0073] Specifically, the copper sleeve retaining ring can be a copper sleeve spring retaining ring to prevent the guide copper sleeve 14 from moving within the guide hole.

[0074] like Figure 2 and Figure 7 As shown, preferably, the device further includes:

[0075] The plug 17 is fitted inside the mounting opening. The plug 17 has a second sliding hole, through which the extension rod 3 passes. One end of the plug 17 can pass through and be installed on the axle gearbox 1.

[0076] Specifically, the plug 17 can be made of 40Cr, and the second sliding hole on the plug 17 serves as a guide for the extension rod 3.

[0077] Preferably, the device further includes an adjusting shim 18, which is pressed between the guide seat 2 and the axle gearbox 1.

[0078] Specifically, the adjusting pad 18 is used to adjust the position of the guide seat 2 so that the limiting mechanism can accurately limit the extension rod.

[0079] Preferably, the linkage plate 16 is provided with two linkage holes;

[0080] The anti-rotation rod 15 has a screw 19 at one end outside the main guide sleeve 7, with one of the linkage holes sleeved on the screw 19, and the nut 20 threadedly connected to the screw 19;

[0081] The extension rod 3 has an internal threaded hole 21 at one end outside the axle gearbox, and the bolt 22 passes through another linkage hole and is threaded into the internal threaded hole 21.

[0082] Specifically, the nuts 20 and bolts 22 are used to fix the two ends of the linkage plate 16 to the anti-rotation rod 15 and the extension rod 3 respectively, and serve as positioning tools.

[0083] Preferably, the end of the plug 17 located inside the main guide sleeve 7 is provided with a shaft seal mounting groove communicating with the second sliding hole. The device also includes a shaft seal 23 and a shaft seal retaining ring 24. The shaft seal 23 is disposed in the shaft seal mounting groove and sleeved on the extension rod 3. The shaft seal retaining ring 24 is disposed in the shaft seal mounting groove and fixed to the side of the shaft seal 23 away from the second sliding hole.

[0084] Specifically, the shaft seal retaining ring 24 can be an elastic shaft seal retaining ring, and the shaft seal 23 is used to seal the axle gearbox 1.

[0085] Preferably, the mounting plate 26 is disposed between the axle gearbox 1 and the connecting plate 8, and the plug 17 has an external threaded wall on its outer side. The plug 17 can be threadedly connected to the axle gearbox and is used to press the mounting plate 26 against the outer wall of the axle gearbox.

[0086] Specifically, the plug is convex in shape, and the external threaded wall is set on the outer wall of the convex plug 17 with a relatively small diameter. The plug 17 is installed on the axle gearbox 1 by means of threaded connection. The stepped surface of the convex plug is attached to the mounting plate 26 to press the mounting plate 26 against the outer wall of the axle gearbox.

[0087] Preferably, the adjusting pad 18 is pressed between the mounting plate 26 and the connecting plate 8.

[0088] Specifically, the adjusting shim 18 is used to adjust the position of the notch 12. When the shift fork is adjusted to the neutral position of the axle gearbox 1, the ring groove 10 can slide to the position of the notch 12 to avoid misalignment between the ring groove 10 and the notch 12, which would prevent the pin 13 from being inserted into the ring groove 10.

[0089] Preferably, the limiting mechanism further includes a support seat 25, which can be connected to the axle gearbox 1. One end of the outer sleeve of the flexible shaft 6 is fixed to the support seat 25, and one end of the inner core of the flexible shaft 6 is connected to one end of the pin 13.

[0090] Specifically, when the handle of the flexible shaft locking controller 4 is swung left and right, the inner core of the rotating shaft 6 will drive the pin 13 to insert into the ring groove 10 or pull it out of the ring groove 10 to lock or unlock the shift fork lever.

[0091] In summary, the neutral locking device for an axle gearbox provided by this invention, when implemented, connects the guide seat 2 to the axle gearbox 1, and the flexible shaft locking controller 4 to the bogie 5 of the screen cleaning machine. The flexible shaft locking controller 4 and the pin 13 are connected via a flexible shaft 6. When the shift fork lever is adjusted to the neutral position of the axle gearbox 1, the annular groove 10 slides to the position of the recess 12. The operator can operate the flexible shaft locking controller 4, and under the transmission action of the flexible shaft 6, control the pin 13 to insert into the annular groove 10, preventing the extension rod 3 from sliding, thereby preventing the shift fork lever from moving. When the shift fork... When the lever needs to be adjusted from neutral to high speed or low speed in the axle gearbox 1, the operator can operate the flexible shaft locking controller 4 again, and under the transmission action of the flexible shaft 6, control the pin 13 to be pulled out from the annular groove 10. Thus, in neutral, the axle gearbox 1 can be prevented from switching from neutral to other gears, improving the reliability of the axle gearbox 1. As a result, the operator only needs to operate the flexible shaft locking controller 4 on the bogie 5 to lock or unlock the shift fork lever. The operator does not need to crawl to the bottom of the screen cleaning machine to operate, which improves the safety of the operator.

[0092] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A neutral locking device for an axle gearbox, characterized in that, The device includes: A guide seat, which can be connected to the axle gearbox of the screen cleaning machine; An extension rod is slidably connected to the guide seat, and one end of the extension rod can penetrate into the axle gearbox and be connected to one end of the shift fork rod inside the axle gearbox; A limiting mechanism is connected to the guide seat, and the limiting mechanism can restrict the extension rod from sliding relative to the guide seat; The operating mechanism includes a flexible shaft locking controller and a flexible shaft. The flexible shaft locking controller can be connected to the bogie of the screen cleaning machine. The two ends of the flexible shaft are respectively connected to the flexible shaft locking controller and the limiting mechanism. When the shift fork is adjusted to the neutral position of the axle gearbox, the flexible shaft locking controller can control the limiting mechanism to restrict the extension rod from sliding relative to the guide seat under the transmission action of the flexible shaft. The guide seat includes: Dominant direction; A connecting plate, one side of which is connected to one end of the main guide sleeve, the connecting plate having an installation port, and the other side of which can be connected to the axle gearbox; An end plate, one side of which is connected to the other end of the main guide sleeve, is provided with a first sliding hole, and the extension rod passes through the first sliding hole, the main guide sleeve and the mounting port in sequence; The limiting mechanism includes: The extension rod has an annular groove on its rod wall inside the main guide sleeve; Connection ports are provided on both opposite side walls of the main guide sleeve; A secondary guide sleeve is disposed inside the primary guide sleeve. The two ends of the secondary guide sleeve are respectively connected to the two connecting ports. The side wall of the secondary guide sleeve is provided with a notch, and the extension rod is slidably connected in the notch. A pin is provided, one end of which is connected to one end of the flexible shaft. The pin is slidably connected within the secondary guide sleeve. When the shift fork is adjusted to the neutral position of the axle gearbox, the annular groove slides to the position of the recess. The flexible shaft locking controller can control the pin to insert into the annular groove under the transmission action of the flexible shaft.

2. The neutral locking device for an axle gearbox according to claim 1, characterized in that, The device also includes: The end plate is provided with a guide hole that communicates with the other port of the main guide sleeve; A guide copper sleeve, which is fitted inside the guide hole; An anti-rotation rod, which passes through and is slidably connected within the guide copper sleeve; The linkage plate has its two ends fixedly connected to the anti-rotation rod and the extension rod, respectively.

3. The neutral locking device for an axle gearbox according to claim 1, characterized in that, The device also includes: A plug is fitted inside the mounting opening. The plug has a second sliding hole, through which the extension rod passes. One end of the plug can pass through and be mounted on the axle gearbox.

4. A neutral locking device for an axle gearbox according to claim 2, characterized in that, The linkage plate is provided with two linkage holes; The anti-rotation rod is provided with a screw at one end outside the main guide sleeve, one of the linkage holes is sleeved on the screw, and a nut is threaded on the screw; The extension rod has an internal threaded hole at one end located outside the axle gearbox, and the bolt passes through another linkage hole and is threaded into the internal threaded hole.

5. A neutral locking device for an axle gearbox according to claim 3, characterized in that, The plug is provided with a shaft seal mounting groove communicating with the second sliding hole at one end inside the main guide sleeve. The device also includes a shaft seal and a shaft seal retaining ring. The shaft seal is disposed in the shaft seal mounting groove and sleeved on the extension rod. The shaft seal retaining ring is disposed in the shaft seal mounting groove and fixed to the side of the shaft seal away from the second sliding hole.

6. A neutral locking device for an axle gearbox according to claim 3, characterized in that, The guide seat also includes a mounting plate, which is used to be disposed between the axle gearbox and the connecting plate. The plug has an external threaded wall on its outer side, and the plug can be threadedly connected to the axle gearbox and is used to press the mounting plate against the outer wall of the axle gearbox.

7. A neutral locking device for an axle gearbox according to claim 2, characterized in that, The limiting mechanism also includes a support base that can be connected to the axle gearbox. One end of the outer sleeve of the flexible shaft is fixed to the support base, and one end of the inner core of the flexible shaft is connected to one end of the pin.

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