Gear shifting mechanism and gearbox

Abstract

The utility model discloses a gear shifting mechanism and a gearbox, and relates to the technical field of gearboxes, the gear shifting mechanism comprises a driving shaft, a gear shifting sliding sleeve is arranged on the driving shaft, and the gear shifting sliding sleeve is in sliding connection with the driving shaft; the shifting fork comprises a connecting part, a gear shifting block is rotatably arranged at the bottom end of the connecting part, and the two sides of the gear shifting block abut against and are connected with the gear shifting sliding sleeves; the driving part is rotatably connected with the shifting fork shaft pin, and the shifting fork shaft pin is connected with the gearbox shell; the driving mechanism is in transmission connection with the driving part. According to the gear shifting mechanism and the gearbox, the technical problems that an existing shifting fork needs to move axially to push the gear shifting sliding sleeve, and the gear shifting mechanism occupies a large arrangement space are solved, the driving mechanism drives the shifting fork to rotate with the shifting fork shaft pin as the axis, the gear shifting block drives the gear shifting sliding sleeve to slide to the designated position to be meshed with gears of different gears, and the gear shifting sliding sleeve is driven by the gear shifting block to rotate. The shifting fork rotates with the shifting fork shaft pin as the axis to replace traditional axial movement, and the arrangement space of the whole gear shifting mechanism is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, and particularly relates to a shifting mechanism and a gearbox. Background Art

[0002] The shifting structure is an important part of an automotive transmission. Its body includes a series of mechanical components such as linkages, gears, and cams. These mechanical components work together to convert the operation of the shift lever into gear changes inside the gearbox. The design and manufacturing precision of this part directly affect the smoothness and accuracy of shifting. Among them, the function of the gearbox shift fork is to transmit the force of the external shifting mechanism to the internal synchronizer sliding sleeve to achieve shift switching. It is an important component of the gearbox and is related to the operating comfort and reliability of the gearbox.

[0003] Currently, the existing gearboxes on the market adopt a shift fork scheme where the shift fork is installed on the shift fork shaft through pins. Both ends of the shift fork shaft are installed on the gearbox housing. The shift fork is pushed axially by the fork claws, and then the shifting sliding sleeve is pushed to achieve shifting. However, the above-mentioned shift fork needs to move axially to push the shifting sliding sleeve, and the shifting mechanism occupies a large layout space. Therefore, a shifting mechanism and a gearbox for solving the above problems are proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a shifting mechanism and a gearbox, which solve the technical problem that the existing shift fork needs to move axially to push the shifting sliding sleeve, and the shifting mechanism occupies a large layout space.

[0005] To achieve the above purpose, the utility model provides a shifting mechanism, including:

[0006] A drive shaft, on which a shifting sliding sleeve is provided, and the shifting sliding sleeve is slidably connected to the drive shaft;

[0007] A shift fork, arranged above the drive shaft, and the shift fork includes:

[0008] A connecting part, at the bottom end of which a shifting block is rotatably arranged, and both sides of the shifting block abut against the shifting sliding sleeve;

[0009] A driving part, rotatably connected to a shift fork shaft pin, and the shift fork shaft pin is connected to the gearbox housing;

[0010] A driving mechanism, drivingly connected to the driving part, and the driving mechanism is used to drive the shift fork to rotate.

[0011] Preferably, the driving mechanism includes: a shifting motor, the output end of the shifting motor is drivingly connected to a planetary gear assembly, and the planetary gear assembly is drivingly connected to the driving part.

[0012] Preferably, the planetary gear assembly includes:

[0013] A ring gear disposed at one end of the shift motor close to the shift fork. A sun gear and a planet carrier are coaxially arranged inside the ring gear. The planet carrier is located on the side of the sun gear away from the shift motor, and the planet carrier is drivingly connected to the driving part;

[0014] Planetary gears. A plurality of the planetary gears are arranged on the side of the planet carrier close to the shift motor, and a plurality of the planetary gears are simultaneously meshed with both the sun gear and the ring gear.

[0015] Preferably, a plurality of first rotating shafts are equiangularly arranged on the side of the planet carrier close to the shift motor, and each first rotating shaft is rotatably connected to one of the planetary gears.

[0016] Preferably, a driving gear is arranged on the side of the planet carrier away from the shift motor, and a sector rack is arranged on the driving part. The sector rack is meshed with the driving gear.

[0017] Preferably, the connecting part is integrally U-shaped, and the opening of the connecting part faces the shift sleeve.

[0018] Preferably, a limiting groove is arranged on the outer peripheral side of the shift sleeve. Both side faces of the shift block abut against the inner side faces of the limiting groove, and the shift block is slidably connected to the limiting groove.

[0019] Preferably, a through connecting hole is arranged on the side face of the connecting part. A pin shaft is arranged on one side of the shift block, and the pin shaft is rotatably connected to the connecting hole.

[0020] Preferably, the shift sleeve is respectively connected to the first gear and the second gear through splines.

[0021] A transmission includes the shift mechanism according to any one of the above.

[0022] Compared with the above background art, the shift mechanism provided by the present utility model has the following beneficial effects: The driving mechanism drives the shift fork to rotate around the shift fork shaft pin. The shift sleeve is driven by the shift block arranged at the bottom end of the connecting part to slide to a specified position and mesh with gears of different gears respectively, completing the gear shift. Replacing the traditional axial movement with the rotation of the shift fork around the shift fork shaft pin can effectively reduce the space occupied by the movement of the shift fork and effectively reduce the layout space of the overall shift mechanism. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 The three-dimensional structure diagram of the shift mechanism provided by the embodiment of the present invention;

[0025] Figure 2 The exploded schematic diagram of the shift mechanism provided by the embodiment of the present invention;

[0026] Figure 3 The plan view of the shift mechanism provided by the embodiment of the present invention.

[0027] Specifically, 1 - fork shaft pin; 2 - driving gear; 3 - sector rack; 4 - planet carrier; 5 - planet gear; 6 - ring gear; 7 - sun gear; 8 - shift motor; 9 - shift fork; 901 - driving part; 902 - connecting part; 10 - shift block; 11 - driving shaft; 12 - shift sleeve; 13 - first gear; 14 - second gear. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] To enable those skilled in the art of this technology to better understand the solution of the present invention, the following will further elaborate on the present invention in detail with reference to the drawings and specific implementation manners.

[0030] As Figure 1 and Figure 2 shown, a shift mechanism includes: a driving shaft 11 and a shift fork 9 provided above the driving shaft 11.

[0031] Among them, the driving shaft 11 is provided with a first gear 13 and a second gear 14. A shift sleeve is provided on the driving shaft 11. The shift sleeve 12 is slidably connected to the driving shaft 11. Specifically, the shift sleeve 12 is located between the first gear 13 and the second gear 14. The shift sleeve 12 moves towards the two end parts of the driving shaft 11 respectively to cooperate with the corresponding first gear 13 or second gear 14 to complete the gear shift.

[0032] The shift fork 9 includes a connecting portion 902 and a driving portion 901, and the driving portion 901 is rotatably connected to the shift fork shaft pin 1. Specifically, a rotating shaft hole is arranged on the side of the driving portion 901, and the rotating shaft hole is used to pass the shift fork shaft pin 1. It should be noted that the shift fork shaft pin 1 and the rotating shaft hole are interference fit. After the shift fork shaft pin 1 is passed through the rotating shaft hole, the shift fork shaft pin 1 cannot rotate freely relative to the rotating shaft hole, wherein the shift fork shaft pin 1 is connected to the gearbox housing, that is, the position of the shift fork shaft pin 1 is fixed relative to the drive shaft 11.

[0033] A driving mechanism is arranged above the driving shaft 11, and the driving mechanism is connected to the driving part 901 through transmission, and power is provided to the shift fork 9 through the driving mechanism. The bottom end of the connecting part 902 is rotatably provided with a shift paddle block 10, and both sides of the shift paddle block 10 are abutted and connected with the shift sleeve 12. The driving shaft 11 drives the driving part 901 to rotate around the shift fork shaft pin 1 as the axis, and the connecting part 902 drives the shift paddle block 10 arranged at the bottom of the connecting part 902 to rotate synchronously, and the shift paddle block 10 further drives the shift sleeve 12 to move until the shift sleeve 12 reaches a specified position and meshes with the corresponding first gear 13 or second gear 14.

[0034] When in use, the driving mechanism drives the shift fork 9 to rotate around the shift fork shaft pin 1 as the axis, and the connecting part 902 drives the shift block 10 to rotate synchronously around the shift fork shaft pin 1 as the axis, that is, the shift fork 9 swings a certain angle around the shift fork shaft pin 1 as the axis, and the shift block 10 drives the shift sleeve 12 to slide to a specified position. At this time, the shift block 10 moves upward relative to the shift sleeve 12 in a direction perpendicular to the axis of the shift sleeve 12, and meshes with the first gear 13 or the second gear 14 respectively to complete the gear switching. The rotation of the shift fork 9 around the shift fork shaft pin 1 as the axis replaces the traditional axial movement, which effectively reduces the space occupied by the movement of the shift fork 9 and reduces the layout space of the overall shift mechanism.

[0035] It should be noted that the driving mechanism is used to drive the shift fork 9 to rotate around the fork shaft pin 1 to drive the shift sleeve 12 to move. Compared with the traditional shift mechanism, while reducing the layout space of the overall shift mechanism, the shift fork shaft, linear bearings and other components are eliminated. The overall shift fork 9 has a simpler structure, thereby achieving lightweight shift mechanism and reducing manufacturing costs.

[0036] like Figure 2 and Figure 3As shown in the figure, the driving mechanism includes: a shifting motor 8. Preferably, the shifting motor 8 is a three-phase asynchronous motor. The output end of the shifting motor 8 is drivingly connected to a planetary gear 5 assembly, and the planetary gear 5 assembly is drivingly connected to a driving part 901. Specifically, the planetary gear 5 assembly includes: a ring gear 6 disposed at one end of the shifting motor 8 close to the shifting fork 9. The position of the ring gear 6 is fixed relative to the gearbox housing. A sun gear 7 and a planet carrier 4 are coaxially disposed inside the ring gear 6. The planet carrier 4 is located on the side of the sun gear 7 away from the shifting motor 8, and the planet carrier 4 is drivingly connected to the driving part 901. In addition, a plurality of planetary gears 5 are disposed on the side of the planet carrier 4 close to the shifting motor 8. The number of the planetary gears 5 is specifically three. The three planetary gears 5 are all meshed with the sun gear 7 and the ring gear 6 at the same time. Among them, the output end of the shifting motor 8 is sleeved with the sun gear 7. The shifting motor 8 drives the sun gear 7 to rotate. The sun gear 7 drives the three planetary gears 5 to rotate on their own axes. Since the three planetary gears 5 are all meshed with the ring gear 6, while the three planetary gears 5 rotate on their own axes, the three planetary gears 5 all revolve synchronously around the sun gear 7 as the axis, thereby driving the planet carrier 4 to rotate around the sun gear 7 as the axis. The rotation of the planet carrier 4 drives the shifting fork 9 to rotate around the shifting fork shaft pin 1. The shifting fork 9 drives the shifting sleeve 12 to slide to a specified position through the shifting block 10, completing the gear shift.

[0037] It should be noted that the sun gear 7 is welded to the motor shaft of the shifting motor 8 to ensure that the shifting motor 8 stably transmits power to the sun gear 7, and the ring gear 6 is fixed to the flange of the shifting motor 8, and the planetary gear 5 assembly stably outputs power. In addition, since the ring gear 6 is fixed, the power is output from the planet carrier 4. The shifting motor 8 outputs power through the motor shaft. After the power passes through the sun gear 7 and the planetary gear 5 assembly and is output, the power is decelerated and torque-increased at the first stage. Further, the power is transmitted from the planet carrier 4 to the driving gear 2, and then from the driving gear 2 to the sector rack 3, for decelerating and torque-increasing at the second stage. Finally, the shifting fork 9 is driven to perform an angular motion around the shifting fork shaft pin 1, effectively increasing the output torque of the shifting motor 8 to provide a greater driving force, stably driving the shifting sleeve 12 to move to the specified position, and thus improving the reliability during high and low gear shifting.

[0038] In an embodiment of the present invention, a plurality of first rotating shafts are equiangularly disposed on the side of the planet carrier 4 close to the shifting motor 8. The axial direction of the first rotating shafts is the same. Each first rotating shaft is rotatably connected to a planetary gear 5, and the three planetary gears 5 drive the planet carrier 4 to rotate around the sun gear 7 as the axis.

[0039] In addition, a driving gear 2 is provided on the side of the planetary carrier 4 away from the shift motor 8. Specifically, a second rotating shaft is provided on the side of the planetary carrier 4 away from the shift motor 8, and the driving gear 2 is sleeved on the second rotating shaft. When the planetary carrier 4 rotates with the sun gear 7 as the axis, the driving gear 2 can be driven to rotate. Among them, the driving part 901 is provided with a sector rack 3, which is meshed and connected with the driving gear 2, and can drive the sector rack 3 and the driving gear 2 to rotate while rotating with the axis.

[0040] In one embodiment of the utility model, the connecting portion 902 is U-shaped as a whole, and the opening of the connecting portion 902 faces the shift sleeve 12. Since the shift fork 9 is arranged above the drive shaft 11 as a whole, by designing the connecting portion 902 into a U-shape, the connecting portion 902 can be fixed on both sides of the shift sleeve 12 to shift the two sides of the shift sleeve 12.

[0041] It should be noted that a limit groove is provided on the outer peripheral side surface of the shift sleeve, the two side surfaces of the shift block 10 abut against the inner side surface of the limit groove, and the shift block 10 is slidably connected to the limit groove. When the shift fork 9 rotates with the shift fork shaft pin 1 as the axis, the connecting portion 902 will move upward a certain distance relative to the shift sleeve 12, and the angle between the connecting portion 902 and the axis of the shift sleeve 12 will change. At this time, the shift block 10 rotates a certain angle relative to the connecting portion 902, and the shift block 10 moves upward in a direction perpendicular to the axis of the shift sleeve 12, thereby ensuring that the connecting portion 902 can always drive the shift sleeve 12 to slide to a specified position.

[0042] Specifically, a connecting hole is provided on the side of the connecting portion 902, and a pin shaft is provided on one side of the shift paddle block 10. The pin shaft is rotatably connected to the connecting hole, and a clamp can be installed at the end of the pin shaft, and the pin shaft will not automatically detach from the connecting hole. On the other hand, the shift paddle block 10 is made of copper material to ensure the wear resistance of the insert when contacting the shift sleeve, so as to improve the service life of the overall shift mechanism.

[0043] In one embodiment of the utility model, the shift sleeve 12 is connected to the first gear 13 and the second gear 14 through a spline respectively. The spline connection has the characteristics of strong load-bearing capacity, high transmission accuracy and the ability to withstand axial force, thereby ensuring the stability of the shift mechanism during operation.

[0044] When the utility model is in use, the shift motor 8 drives the sun gear 7 to rotate. The sun gear 7 drives the three planetary gears 5 to rotate around their respective first rotating shafts. At the same time, the three planetary gears 5 revolve around the sun gear 7 as the center to drive the planet carrier 4 to rotate around the sun gear 7 as the center. The planet carrier 4 drives the sector rack 3 to rotate around the shift fork shaft pin 1 through the driving gear 2, that is, the shift fork 9 rotates around the shift fork shaft pin 1. The connecting portion 902 drives the shift block 10 to rotate synchronously around the shift fork shaft pin 1, that is, the shift fork 9 swings a certain angle around the shift fork shaft pin 1. At this time, the shift block 10 moves upward relative to the shift sleeve 12 in a direction perpendicular to the axis of the shift sleeve 12. The shift block 10 drives the shift sleeve 12 to slide to a specified position and engage with the first gear 13 or the second gear 14 respectively, adjusting the transmission to the specified gear position.

[0045] In summary, the driving mechanism drives the shift fork 9 to rotate around the shift fork shaft pin 1, and further drives the shift sleeve 12 to slide to a specified position through the shift block 10, engaging with the gears of different gear positions respectively to complete the gear shift. Replacing the traditional axial movement with the rotation of the shift fork 9 around the shift fork shaft pin 1 effectively reduces the space occupied by the movement of the shift fork 9, and further reduces the layout space of the overall shift mechanism.

[0046] In addition to the above shift mechanism, the utility model also provides a transmission including the shift mechanism disclosed in the above embodiment. For the structures of other parts of this transmission, please refer to the prior art and will not be elaborated herein.

[0047] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0048] Specific examples are used in this article to elaborate on the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the utility model, several improvements and modifications can still be made to the utility model, and these improvements and modifications also fall within the protection scope of the utility model.

Claims

1. A shift mechanism, characterized in that, include: A driving shaft, wherein the driving shaft is provided with a shift sleeve, and the shift sleeve is slidably connected to the driving shaft; A shift fork is arranged above the driving shaft, and the shift fork comprises: A connecting portion, a shift paddle block is rotatably arranged at the bottom end of the connecting portion, and two sides of the shift paddle block abut against the connecting portion and the shift sleeve; A driving part, wherein the driving part is rotatably connected to a shift fork shaft pin, and the shift fork shaft pin is connected to a gearbox housing; A driving mechanism is transmission-connected to the driving part, and the driving mechanism is used to drive the shift fork to rotate.

2. The shift mechanism according to claim 1, characterized in that, The driving mechanism comprises: a shift motor, an output end of the shift motor is transmission-connected to a planetary gear assembly, and the planetary gear assembly is transmission-connected to the driving part.

3. A shift mechanism according to claim 2, characterized in that, The planetary gear assembly comprises: A gear ring, arranged at one end of the gear shifting motor close to the shift fork, a sun gear and a planet carrier are coaxially arranged inside the gear ring, the planet carrier is located at a side of the sun gear away from the gear shifting motor, and the planet carrier is drivingly connected to the driving part; Planetary gears, a plurality of the planetary gears are arranged on a side of the planetary carrier close to the gear shifting motor, and a plurality of the planetary gears are simultaneously meshed and connected with the sun gear and the ring gear.

4. A shift mechanism according to claim 3, characterized in that, A plurality of first rotating shafts are arranged at equal angles on one side of the planetary carrier close to the shift motor, and each of the first rotating shafts is rotatably connected to one of the planetary gears.

5. A shift mechanism according to claim 4, characterized in that, A driving gear is arranged on a side of the planet carrier away from the gear-shifting motor, and the driving part is provided with a sector-shaped rack, which is meshed and connected with the driving gear.

6. A shift mechanism according to any one of claims 1-5, characterized in that, The connecting portion is in a U shape as a whole, and an opening of the connecting portion faces the shift sleeve.

7. The shift mechanism according to claim 6, characterized in that, A limiting groove is arranged on the outer peripheral side surface of the shift sliding sleeve, two side surfaces of the shift paddle block abut against the inner side surface of the limiting groove, and the shift paddle block is slidably connected to the limiting groove.

8. A shift mechanism according to claim 7, characterized in that, A penetrating connecting hole is arranged on the side of the connecting portion, and a pin shaft is arranged on one side of the shift paddle block, and the pin shaft is rotatably connected to the connecting hole.

9. A shift mechanism according to any one of claims 1-5, characterized in that, The shift sleeve is connected to the first gear and the second gear via splines respectively.

10. A gearbox, characterized in that, The invention comprises the shifting mechanism according to any one of claims 1 to 9.

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