Gear shifting sliding sleeve limiting device and gearbox

Abstract

The utility model discloses a gear shifting sliding sleeve limiting device and a gearbox, and relates to the technical field of gearboxes, the gear shifting sliding sleeve limiting device comprises a gear shaft, the gear shaft is rotatably connected with a driving gear, and one end of the driving gear is provided with a joint fluted disc; the gear hub is arranged on the gear shaft in a sleeving mode, the gear hub is in transmission connection with the gear shifting sliding sleeve, and the gear shifting sliding sleeve is in sliding connection with the joint fluted disc; and the limiting plate is connected with the first end of the joint fluted disc. According to the gear shifting sliding sleeve limiting device and the gearbox, the technical problem that the gear shifting sliding sleeve cannot be effectively limited in the axial direction due to the fact that the outer diameter of the joint fluted disc is larger than that of the low-speed-gear driving gear in the prior art is solved, and the limiting plate is arranged at one end of the joint fluted disc; when the gearbox is in a first gear or a climbing gear, the gearbox can bear large torque and impact, meanwhile, the axial position of the gear shifting sliding sleeve can be limited through the limiting plate, the situation that when the gear shifting sliding sleeve impacts the joint fluted disc, a limiting face loses efficacy is avoided, and the gear shifting sliding sleeve is stably limited in the axial direction.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a gearshift sliding sleeve limiting device and a gearbox. Background Art

[0002] The gearbox is a mechanism used to change the speed and torque of the engine. The gearbox consists of a speed transmission mechanism and an operating mechanism. The transmission mechanism is mostly driven by ordinary gears. The requirements for the gearbox of new energy commercial vehicles require that the high speed input of the motor be converted into a high torque output of the gearbox, which places high demands on the gear position and gear ratios of each gear.

[0003] When the traditional gearbox outputs the maximum torque, it will engage the first gear with the largest speed ratio or the climbing gear. For the first gear with a large speed ratio or the climbing gear, the difference in the number of teeth of the master and driven gears is large, which causes the top circle diameter of the driving gear to be small and cannot withstand the impact of large torque and load. When the gear hub, sliding sleeve and other shifting components are designed to be larger than the top circle diameter of the low-speed gear driving gear, the gear shifting sleeve cannot be effectively limited in the axial direction because the outer diameter of the engagement tooth plate is larger than the outer diameter of the low-speed gear driving gear. Therefore, a shifting sleeve limiting device and a gearbox are proposed to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a shift sleeve limiting device and a gearbox, which solves the technical problem in the prior art that the outer diameter of the engaging toothed disc is larger than the outer diameter of the low-speed gear driving gear and the shift sleeve cannot be effectively limited in the axial direction.

[0005] In order to achieve the above object, the utility model provides a shift sleeve limiting device, comprising:

[0006] Gear shaft;

[0007] A driving gear is rotatably connected to the gear shaft, and one end of the driving gear is provided with a coupling toothed disc;

[0008] A gear hub, sleeved on the gear shaft, the gear hub is drivingly connected to a shift sleeve, and the shift sleeve is slidably connected to the engagement gear plate;

[0009] A limit plate is connected to the first end of the engaging gear plate, and the limit plate is used to limit the axial position of the shift sleeve.

[0010] Preferably, a hollow boss is provided at the first end of the driving gear, and the limiting plate and the engaging toothed disc are sequentially sleeved on the outer peripheral side surface of the hollow boss, and the overall diameter of the limiting plate is greater than the overall diameter of the engaging toothed disc.

[0011] Preferably, the end surface of the second end of the limiting plate is in contact with the end surface of the first end of the driving gear, and a first stepped groove is provided on the inner peripheral side surface of the limiting plate.

[0012] Preferably, the end surface of the second end of the engaging toothed disc is in contact with the end surface of the first end of the limiting plate, and a second stepped groove is provided on the inner peripheral side surface of the engaging toothed disc.

[0013] Preferably, a first matching hole is provided at the axial position of the engaging toothed disc, and the first matching hole is interference-connected with the hollow boss.

[0014] Preferably, one end of the first matching hole is provided with a chamfer, and the chamfer is used to reserve space for a weld scar between the engaging toothed disc and the limiting plate.

[0015] Preferably, a second matching hole is provided at the axial position of the limiting plate, and the second matching hole is interference connected to the hollow boss.

[0016] Preferably, a needle bearing is provided on the outer peripheral side of the gear shaft, and the outer peripheral side of the needle bearing is clamped and connected to the driving gear.

[0017] A gearbox comprises the shift sleeve limiting device as described in any one of the above items.

[0018] Compared with the above-mentioned background technology, the utility model provides a shift sleeve limiting device, which has the following beneficial effects: a limiting plate is arranged at one end of the engaging toothed disc, and when the engaging toothed disc is enlarged and the outer diameter of the engaging toothed disc is larger than the outer diameter of the low-speed gear driving gear, the gearbox is subjected to a larger torque and impact in the first gear or the climbing gear. At the same time, the axial position of the shift sleeve can be limited by the limiting plate, thereby avoiding failure of the limiting surface when the shift sleeve impacts the engaging toothed disc, and the shift sleeve is stably limited in the axial direction, thereby effectively meeting the axial limiting requirements of the shift sleeve and improving the stability and safety of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A cross-sectional schematic diagram of a position limiting device provided in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0022] Figure 3 A cross-sectional schematic diagram of another structural state of the limiting device provided by an embodiment of the utility model;

[0023] Figure 4 for Figure 3 The enlarged schematic diagram of point B in the middle;

[0024] Figure 5 A three-dimensional structural diagram of a limit plate provided in an embodiment of the utility model;

[0025] Figure 6 A schematic cross-sectional view of a limit plate provided in an embodiment of the utility model;

[0026] Figure 7 A three-dimensional structural diagram of a coupling toothed disc provided in an embodiment of the utility model;

[0027] Figure 8 A cross-sectional schematic diagram of a coupling toothed disc provided in an embodiment of the utility model.

[0028] Specifically, 1-gear shaft; 2-driving gear; 201-hollow boss; 3-engaging gear plate; 301-second step groove; 4-gear hub; 5-shift sleeve; 6-limiting plate; 601-first step groove; 7-needle bearing. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 and Figure 3 As shown, a shift sleeve 5 limiting device comprises: a gear shaft 1, a driving gear 2, a shift sleeve 5, a gear hub 4 and a limiting plate 6.

[0032] The gear shaft 1 is rotatably connected to the driving gear 2, wherein the driving gear 2 is sleeved on the gear shaft 1, and a coupling toothed disc 3 is provided at the left end of the driving gear 2, and the coupling toothed disc 3 is fixedly connected to the driving gear 2, that is, the coupling toothed disc 3 cannot rotate freely relative to the driving gear 2, and the driving gear 2 can be driven to rotate synchronously through the coupling toothed disc 3.

[0033] A gear hub 4 is sleeved on the gear shaft 1, and a plurality of first internal splines are arranged on the inner circumferential side of the gear hub 4, and a plurality of first external splines are arranged on the outer circumferential side of the gear shaft 1, and each first internal spline corresponds to a first external spline, so that the gear hub 4 is fixedly sleeved on the gear shaft 1, and the gear hub 4 cannot rotate freely relative to the gear shaft 1, and the gear shaft 1 can drive the gear hub 4 to rotate synchronously.

[0034] At the same time, a second external spline is arranged on the outer peripheral side of the gear hub 4, and a second internal spline is arranged on the inner peripheral side of the gear shift sleeve 5, and each second internal spline corresponds to a second external spline, and the gear shift sleeve 5 is sleeved on the gear hub 4, and the gear hub 4 is transmission-connected to the gear shift sleeve 5, wherein the gear shift sleeve 5 is slidingly connected to the gear hub 4, and the gear hub 4, the gear shift sleeve 5 and the gear shaft 1 are coaxially constrained, and the gear shift sleeve 5 is slidingly connected to the engaging sprocket 3. By adjusting the position of the gear shift sleeve 5, when the gear shift sleeve 5 is transmission-connected to the gear hub 4 and the engaging sprocket 3 at the same time, it plays a role in transmitting torque.

[0035] The right end of the engaging sprocket 3 is connected to the limit plate 6. Preferably, the engaging sprocket 3 and the limit plate 6 are both made of steel. The engaging sprocket 3 can be welded to the limit plate 6. When the shift sleeve 5 moves to the right to engage with the engaging sprocket 3, the left end surface of the limit plate 6 can abut against the right end surface of the shift sleeve 5, thereby limiting the axial position of the shift sleeve 5, so that the shift sleeve 5 is stably limited in the axial direction, thereby allowing the entire gearbox to withstand greater torque and load impacts.

[0036] like Figure 2 and Figure 4 As shown, when in use, the gear shaft 1 rotates to drive the gear hub 4 to rotate. In the initial state, the shift sleeve 5 is located at the left end limit position under the pulling action of the shift mechanism. At this time, the shift sleeve 5 and the engagement sprocket 3 do not contact each other, and the gearbox is in high gear. When the shift sleeve 5 is pushed to the right end limit position by the shift mechanism, the left end surface of the limit plate 6 abuts against the right end surface of the shift sleeve 5, effectively limiting the axial position of the shift sleeve 5, avoiding the failure of the limit surface when the shift sleeve 5 impacts the engagement sprocket 3, so that the shift sleeve 5 is stably limited in the axial direction, and the shift sleeve 5 and the engagement sprocket 3 are meshed with each other. At this time, the gearbox is in the climbing gear, the gear hub 4 drives the engagement sprocket 3 to rotate, and the engagement sprocket 3 drives the driving gear 2 to rotate, and the driving gear 2 stably outputs torque. It should be noted that the shift mechanism is a relatively mature technology in the prior art, and it will not be described in detail in this article.

[0037] A hollow boss 201 is provided at the left end of the driving gear 2, and the outer peripheral side surface of the hollow boss 201 is sequentially sleeved with a limit plate 6 and an engaging sprocket disc 3, wherein the limit plate 6 is connected to the engaging sprocket disc 3 by welding, and the overall diameter of the limit plate 6 is greater than the overall diameter of the engaging sprocket disc 3. When the shift sleeve 5 moves toward the right end of the engaging sprocket disc 3, it is ensured that the limit plate 6 can effectively limit the shift sleeve 5.

[0038] like Figure 5 and Figure 6 As shown, the left end face of the driving gear 2 is fitted with the right end face of the limit plate 6, and the inner peripheral side surface of the limit plate 6 is provided with a first stepped groove 601, wherein the first stepped groove 601 is ring-shaped as a whole. At this time, a welding groove is reserved for the junction of the left end face of the driving gear 2 and the right end face of the limit plate 6. When the driving gear 2 is in the state of the cross-sectional schematic diagram, the welding groove here is J-shaped as a whole, which can effectively improve the welding performance and avoid the influence of weld scars on the axial positioning of the driving gear 2 and the limit plate 6 after layered welding.

[0039] like Figure 7 and Figure 8 As shown, the left end face of the limit plate 6 fits the right end face of the engaging sprocket 3, and the inner peripheral side face of the engaging sprocket 3 is provided with a second step groove 301, wherein the second step groove 301 is also in a ring shape as a whole, and a welding groove is reserved for the junction of the right end face of the engaging sprocket 3 and the left end face of the limit plate 6. When the engaging sprocket 3 is in the state of the cross-sectional schematic diagram, the welding groove here is in a J shape as a whole, which can effectively improve the welding performance and avoid the influence of weld scars on the axial positioning of the engaging sprocket 3 and the limit plate 6 after layered welding.

[0040] A first matching hole is provided at the axial position of the engagement toothed disc 3, and the first matching hole is interference-connected with the hollow boss 201. At the same time, a second matching hole is provided at the axial position of the limit plate 6, and the second matching hole is interference-connected with the hollow boss 201, so as to ensure that the gear shaft 1 can stably drive the limit plate 6 and the engagement toothed disc 3 to operate synchronously. In addition, a chamfer is provided at the left end of the first matching hole, and the chamfer further reserves space for the welding scar left when the limit plate 6 and the engagement toothed disc 3 are welded, thereby improving the axial positioning accuracy of the engagement toothed disc 3 and the limit plate 6.

[0041] In one embodiment of the utility model, a plurality of limit strips (not shown in the figure) are arranged in an array on the inner peripheral side surface of the first matching hole, and the limit strips extend along the axial direction of the engaging toothed disc 3. At the same time, a plurality of limit grooves (not shown in the figure) are arranged in an array on the outer peripheral side surface of the hollow boss 201, and each limit groove corresponds to a limit strip, and the limit strip can slide relative to the limit strip. After the engaging toothed disc 3 is stably sleeved on the hollow boss 201, the limit strip and the limit slot cooperate to further limit the engaging toothed disc 3 and the driving gear 2, thereby preventing relative rotation between the engaging toothed disc 3 and the driving gear 2, preventing transmission failure, and improving the stability of the gearbox output torque.

[0042] In one embodiment of the utility model, a needle bearing 7 is arranged on the outer peripheral side of the gear shaft 1, and the outer peripheral side of the needle bearing 7 is clamped and connected to the driving gear 2. The arrangement of the needle bearing 7 can ensure that the driving gear 2 can rotate freely relative to the gear shaft 1, thereby ensuring that the gearbox can stably transmit torque.

[0043] When the utility model is used, the gear shaft 1 rotates to drive the gear hub 4 to rotate. In the initial state, the shift sleeve 5 moves from the left end limit position to the right end limit position under the driving action of the shift mechanism. At this time, the shift sleeve 5 and the engaging sprocket 3 are meshed with each other, and the left end face of the limit plate 6 abuts against the right end face of the shift sleeve 5. The gearbox is in the climbing gear, the gear hub 4 drives the engaging sprocket 3 to rotate, and the engaging sprocket 3 drives the driving gear 2 to rotate, and the driving gear 2 outputs torque.

[0044] In summary, the limiting device uses enlarged engaging teeth and the outer diameter of the engaging tooth plate 3 is larger than the outer diameter of the low-speed gear driving gear 2, so that the gearbox can withstand greater torque and impact in the first gear or climbing gear. At the same time, the limiting plate 6 provided at one end of the engaging tooth plate 3 allows the shift sleeve 5 to be stably limited in the axial direction, thereby effectively meeting the axial limiting requirements for the shift sleeve 5 and improving the stability and safety of the gearbox.

[0045] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0046] In addition to the above-mentioned limiting device, the present invention also provides a gearbox including the limiting device disclosed in the above-mentioned embodiment. For the structures of other parts of the gearbox, please refer to the prior art and will not be described in detail herein.

[0047] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A shift sleeve limiting device, characterized in that: include: Gear shaft; A driving gear is rotatably connected to the gear shaft, and one end of the driving gear is provided with a coupling toothed disc; A gear hub, sleeved on the gear shaft, the gear hub is drivingly connected to a shift sleeve, and the shift sleeve is slidably connected to the engagement gear plate; A limit plate is connected to the first end of the engaging gear plate, and the limit plate is used to limit the axial position of the shift sleeve.

2. The shift sleeve limiting device according to claim 1, characterized in that: A hollow boss is provided at the first end of the driving gear, and the limiting plate and the engaging toothed disc are sequentially sleeved on the outer peripheral side surface of the hollow boss, and the overall diameter of the limiting plate is greater than the overall diameter of the engaging toothed disc.

3. The shift sleeve limiting device according to claim 2, characterized in that: The end surface of the second end of the limiting plate is in contact with the end surface of the first end of the driving gear, and a first stepped groove is provided on the inner peripheral side surface of the limiting plate.

4. The shift sleeve limiting device according to claim 3, characterized in that: The end surface of the second end of the engaging toothed disc is in contact with the end surface of the first end of the limiting plate, and a second stepped groove is provided on the inner peripheral side surface of the engaging toothed disc.

5. A shift sleeve limiting device according to any one of claims 2 to 4, characterized in that: A first matching hole is provided at the axial position of the engaging toothed disc, and the first matching hole is interference-connected with the hollow boss.

6. The shift sleeve limiting device according to claim 5, characterized in that: One end of the first matching hole is provided with a chamfer, and the chamfer is used to reserve space for the welding scar between the engaging toothed disc and the limiting plate.

7. A shift sleeve limiting device according to any one of claims 2 to 4, characterized in that: A second matching hole is provided at the axis position of the limiting plate, and the second matching hole is interference connected with the hollow boss.

8. The shift sleeve limiting device according to any one of claims 1 to 4, characterized in that: A needle bearing is arranged on the outer peripheral side of the gear shaft, and the outer peripheral side of the needle bearing is clamped and connected with the driving gear.

9. A gearbox, characterized in that: It comprises the shift sleeve limiting device as described in any one of claims 1 to 8 above.

Images