Internal gear buffer connection structure for new energy vehicle gearbox and assembly method thereof

Abstract

The present invention discloses an internal gear buffer connection structure for a new energy vehicle gearbox and an assembly method thereof, and relates to the field of gear buffering of a gearbox. The present invention comprises an output shaft, wherein a first output gear is rotatably connected to the left side of the output shaft through a bearing, a second output gear is rotatably connected to the right side of the output shaft through a bearing, a synchronous gear is fixedly connected to the middle of the output shaft, and a speed change gear sleeve is meshingly connected to the side wall of the synchronous gear. When the speed change gear sleeve is shifted toward the first output gear or the second output gear, the impact force generated when the speed change gear sleeve is meshed with an engaging gear ring is slowed down by the action of a buffer spring. Moreover, when the air in the inner cavity of the buffer groove is squeezed, it can not only have a heat dissipation effect on the synchronous gear and the side wall of the meshing gear ring, but also have a certain resistance effect on the movable buffer ring, thereby further improving the buffering effect generated when the fixed buffer ring contacts the movable buffer ring.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox gear buffering, and in particular to an internal gear buffering connection structure for a new energy vehicle gearbox and an assembly method thereof. Background Art

[0002] The gearbox is a mechanism used to change the speed and torque from the engine. It can change the transmission ratio of the output shaft and the input shaft in a fixed or step-by-step manner. It is also called a transmission. The transmission consists of a speed transmission mechanism and an operating mechanism. Transmission gears often work at high speeds, high loads, and with speeds and loads constantly changing. When shifting gears in the gearbox, the speed gear sleeve will move toward the output gears of different diameters, causing the speed gear sleeve to directly collide with the side wall of the output gear, ultimately achieving an extrusion effect. Then, under the extrusion effect again, the synchronous gear, the speed gear sleeve, and the output gear will reach the same speed state. At this time, when the speed gear sleeve obtains a continuous thrust to move toward the output gear, it will complete the meshing with the side wall of the output gear, thereby completing the gear shifting operation.

[0003] The above-mentioned traditional method of directly achieving the same speed by collision, contact and extrusion during the speed change process will cause certain collision and wear to the contact end of the speed gear sleeve and the output gear, which will cause damage to the speed gear sleeve and the output gear over time, and ultimately lead to the inability to complete the gear shifting operation normally in the gearbox, or cause the vehicle to stall or shake during driving; and the transmission method of achieving the same speed by extrusion is less efficient, because the contact surfaces between the two are relatively smooth, and there will be relative sliding under the action of the lubricating fluid, which increases the time required for the same speed, and may even make it impossible to achieve the same speed, which will cause very serious wear between the teeth of the speed gear sleeve and the output gear when the gearbox changes speed, thereby accelerating the damage of the speed gear sleeve and the output gear and reducing the service life of the gearbox. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the method of achieving the same speed through collision, contact and extrusion in the prior art will cause certain collision wear to the contact end of the speed change gear sleeve and the output gear, and the transmission method of achieving the same speed through extrusion in a lubricated environment has low efficiency, and an internal gear buffer connection structure and an assembly method for a new energy vehicle gearbox are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An internal gear buffer connection structure for a new energy vehicle gearbox and an assembly method thereof, comprising:

[0007] An output shaft, wherein the left side of the output shaft is rotatably connected to a first output gear via a bearing, the right side of the output shaft is rotatably connected to a second output gear via a bearing, a synchronous gear is fixedly connected to the middle of the output shaft, a speed change gear sleeve is meshedly connected to the side wall of the synchronous gear, and a shift lever is fixedly connected to the side wall of the speed change gear sleeve;

[0008] A buffer assembly is installed on both sides of the speed gear sleeve, and is used to reduce the impact force generated when the speed gear sleeve is meshed with the synchronous gear, and can quickly make the synchronous gear and the first output gear or the second output gear achieve the same speed;

[0009] A heat dissipation component, wherein the power end of the heat dissipation component is installed on both sides of the synchronous gear, and the output end of the heat dissipation component is installed on the side walls of the first output gear and the second output gear. The heat dissipation component is used to reduce the heat generated when the first output gear or the second output gear is engaged and rotated with the engine gear.

[0010] Preferably, buffer grooves are provided on both sides of the speed gear sleeve, and the buffer assembly includes a movable buffer ring, which is slidably connected to the inner wall of the buffer groove, a buffer spring is fixedly connected between the side wall of the movable buffer ring and the inner wall of the buffer groove, and the buffer groove is communicated with the inner ring of the speed gear sleeve.

[0011] Preferably, the first output gear and the second output gear are fixedly connected to a fixed buffer ring on one side close to the speed gear sleeve, the side walls of the fixed buffer ring are provided with locking grooves at equal intervals, a locking block is slidably connected to the inner cavity of the locking groove, and a reset spring is fixedly connected between the bottom of the locking block and the locking groove.

[0012] Preferably, an extrusion groove is provided on one side of the first output gear and the second output gear close to the speed gear sleeve, and an extrusion ring is slidably connected inside the extrusion groove. The extrusion ring is aligned with the upper edge of the side wall of the speed gear sleeve, and the extrusion ring is located outside the fixed buffer ring, and the extrusion groove is communicated with the inner cavity of the locking groove.

[0013] Preferably, the fixed buffer ring is aligned with the movable buffer ring, the fixed buffer ring is slidably connected to the inner wall of the buffer groove, the outer diameter of the fixed buffer ring is equal to the inner diameter of the buffer groove, and the length of the fixed buffer ring is less than the maximum retraction length of the buffer spring.

[0014] Preferably, the width of the speed gear sleeve is greater than that of the synchronous gear, and the speed gear sleeve can slide with the side wall of the synchronous gear, and the first output gear and the second output gear are fixedly connected with a meshing gear ring on one side close to the speed gear sleeve.

[0015] Preferably, the meshing gear ring has the same outer diameter as the synchronous gear, the meshing gear ring is meshingly connected with the inner wall of the speed gear sleeve, and the speed gear sleeve can slide with the side wall of the meshing gear ring.

[0016] Preferably, a rotating cavity is provided on both sides of the synchronous gear, the heat dissipation assembly includes a driving blade, the driving blade is fixedly connected to the side wall of the rotating cavity, a connecting hole is provided on the side wall of the synchronous gear, and a connecting cavity is provided on the side of the meshing gear ring close to the synchronous gear, and the connecting cavity is the same size as the rotating cavity.

[0017] Preferably, the inner wall of the connection cavity is provided with heat dissipation holes at equal intervals, and the output ends of the heat dissipation holes are arranged on the side walls of the meshing ends of the first output gear and the second output gear.

[0018] The assembly method of the internal gear buffer connection structure for the new energy vehicle gearbox is as follows:

[0019] S1. When shifting, use the gear lever inside the vehicle to pull the shift lever, so that the speed gear sleeve slides. When the speed gear sleeve shifts to the first output gear or the second output gear, the fixed buffer ring will first contact the movable buffer ring. At this time, the buffer spring will reduce the impact force generated when the speed gear sleeve meshes with the meshing gear ring.

[0020] S2. When the fixed buffer ring and the movable buffer ring are squeezed, the gas in the buffer groove will be ejected toward the side wall of the synchronous gear and the meshing gear ring. When shifting gears, a flowing wind force can act on the side wall of the synchronous gear and the meshing gear ring, thereby not only cleaning the lubricating liquid that is difficult to flow attached to the side wall, but also having a certain heat dissipation effect on the side wall of the synchronous gear and the meshing gear ring;

[0021] S3. When the speed gear sleeve is about to fit with the side wall close to the first output gear or the second output gear, the side wall of the speed gear sleeve will resist the extrusion ring, so that the gas in the extrusion groove is filled into the inner cavity of the locking groove, and then the locking block has a tendency to extend outward, so that the fixed buffer ring can fit closely with the side wall of the buffer groove, so that the synchronous gear and the first output gear or the second output gear can quickly achieve the same speed, and then the pause feeling when the gearbox shifts can be reduced, thereby improving the consistency of the gearbox shifting;

[0022] S4. When the synchronous gear and the first output gear or the second output gear achieve the same speed, the speed change gear sleeve continues to move and will mesh with the meshing gear ring, thereby completing the gear shift. At this time, the connecting cavity and the rotating cavity will fit together, and the synchronous gear will drive the driving blade to rotate, so that the gas and lubricating fluid in the gearbox enter from the connecting hole, pass through the connecting cavity and the rotating cavity, and are finally discharged from the heat dissipation hole, thereby achieving heat dissipation of the side wall of the meshing end of the first output gear and the second output gear.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the present invention, when the speed gear sleeve is shifted to the first output gear or the second output gear, the fixed buffer ring will first contact the movable buffer ring. At this time, the buffer spring will reduce the impact force generated when the speed gear sleeve is engaged with the meshing gear ring; and when the air in the buffer groove is squeezed, it can not only have a heat dissipation effect on the synchronous gear and the side wall of the meshing gear ring, but also have a certain resistance effect on the movable buffer ring, thereby further improving the buffer effect generated when the fixed buffer ring contacts the movable buffer ring.

[0025] 2. According to the present invention, when the speed gear sleeve is about to approach the first output gear or the second output gear, the side wall of the speed gear sleeve will contact the extrusion ring, thereby filling the gas in the extrusion groove into the inner cavity of the locking groove, and then the locking block has a tendency to extend outward, so that the locking block can fit tightly with the side wall of the buffer groove, thereby improving the friction effect between the fixed buffer ring and the buffer groove, and effectively avoiding relative sliding between the fixed buffer ring and the buffer groove, so that the synchronous gear and the first output gear or the second output gear can quickly achieve the same speed, thereby reducing the pause feeling when the gearbox shifts, thereby improving the continuity of the gearbox shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the first output gear installation structure of the internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention;

[0028] Figure 3 This is a schematic diagram of the second output gear installation structure of the internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the disassembled structure of the internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention;

[0030] Figure 5 This is a schematic diagram of the split top view of the internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention;

[0031] Figure 6 This is a schematic diagram of a split half-section structure of an internal gear buffer connection structure for a new energy vehicle gearbox proposed by the present invention;

[0032] Figure 7 The internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention Figure 6 A schematic diagram of the enlarged structure of the middle A area;

[0033] Figure 8 The internal gear buffer connection structure for the new energy vehicle gearbox proposed by the present invention Figure 6 Schematic diagram of the enlarged structure of area B in the middle.

[0034] In the figure: 1. output shaft; 2. first output gear; 3. second output gear; 4. synchronous gear; 41. rotating cavity; 5. speed gear sleeve; 6. shift lever; 7. buffer assembly; 71. movable buffer ring; 72. buffer spring; 73. fixed buffer ring; 74. locking block; 75. reset spring; 76. extrusion ring; 8. heat dissipation assembly; 81. driving blade; 82. connecting hole; 83. heat dissipation hole; 9. meshing gear ring; 91. connecting cavity. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Reference Figure 1-5 , an internal gear buffer connection structure for a new energy vehicle gearbox and an assembly method thereof, comprising:

[0037] An output shaft 1, a first output gear 2 is rotatably connected to the left side of the output shaft 1 through a bearing, a second output gear 3 is rotatably connected to the right side of the output shaft 1 through a bearing, a synchronous gear 4 is fixedly connected to the middle of the output shaft 1, a speed change gear sleeve 5 is meshedly connected to the side wall of the synchronous gear 4, and a shift lever 6 is fixedly connected to the side wall of the speed change gear sleeve 5;

[0038] Buffer components 7, which are installed on both sides of the speed change gear sleeve 5. The buffer components 7 are used to reduce the impact force generated when the speed change gear sleeve 5 is meshed with the synchronous gear 4, and can quickly make the synchronous gear 4 and the first output gear 2 or the second output gear 3 achieve the same speed;

[0039] The heat dissipation component 8 has a power end mounted on both sides of the synchronous gear 4, and an output end mounted on the side walls of the first output gear 2 and the second output gear 3. The heat dissipation component 8 is used to reduce the heat generated when the first output gear 2 or the second output gear 3 is meshed and rotated with the engine gear.

[0040] Reference Figure 7 , Figure 8 , wherein buffer grooves are provided on both sides of the speed gear sleeve 5, the buffer assembly 7 comprises a movable buffer ring 71, the movable buffer ring 71 is slidably connected to the inner wall of the buffer groove, a buffer spring 72 is fixedly connected between the side wall of the movable buffer ring 71 and the inner wall of the buffer groove, and the buffer groove is communicated with the inner ring of the speed gear sleeve 5;

[0041] Reference Figure 7 , Figure 8 , wherein the first output gear 2 and the second output gear 3 are fixedly connected to a fixed buffer ring 73 on one side close to the speed change gear sleeve 5, the side wall of the fixed buffer ring 73 is provided with locking grooves at equal intervals, the inner cavity of the locking groove is slidably connected with a locking block 74, and a reset spring 75 is fixedly connected between the bottom of the locking block 74 and the locking groove;

[0042] Reference Figure 7 , Figure 8 , wherein, an extrusion groove is provided on one side of the first output gear 2 and the second output gear 3 close to the speed gear sleeve 5, and an extrusion ring 76 is slidably connected inside the extrusion groove, and the extrusion ring 76 is aligned with the upper edge of the side wall of the speed gear sleeve 5, and the extrusion ring 76 is located outside the fixed buffer ring 73, and the extrusion groove is connected to the inner cavity of the locking groove;

[0043] Reference Figure 6 , Figure 7 and Figure 8 , wherein the fixed buffer ring 73 is aligned with the movable buffer ring 71, the fixed buffer ring 73 is slidably connected to the inner wall of the buffer groove, and the outer diameter of the fixed buffer ring 73 is equal to the inner diameter of the buffer groove, and the length of the fixed buffer ring 73 is less than the maximum retraction length of the buffer spring 72;

[0044] Reference Figure 2 , Figure 3 , wherein the width of the speed gear sleeve 5 is greater than the width of the synchronous gear 4, and the speed gear sleeve 5 can slide with the side wall of the synchronous gear 4, and the first output gear 2 and the second output gear 3 are fixedly connected to the side of the speed gear sleeve 5 close to the meshing gear ring 9;

[0045] Reference Figure 2 , Figure 3 , wherein the meshing gear ring 9 has the same outer diameter as the synchronous gear 4, the meshing gear ring 9 is meshedly connected with the inner wall of the speed gear sleeve 5, and the speed gear sleeve 5 can slide with the side wall of the meshing gear ring 9;

[0046] By setting the above structure, when shifting, the gear lever in the vehicle is used to pull the shift lever 6 to make the speed gear sleeve 5 slide. When the speed gear sleeve 5 is shifted to the first output gear 2 or the second output gear 3, the fixed buffer ring 73 will first contact the movable buffer ring 71 and squeeze the movable buffer ring 71 into the buffer groove. At this time, the buffer spring 72 will be used to slow down the impact force generated when the speed gear sleeve 5 is meshed with the meshing gear ring 9, thereby improving the service life of the speed gear sleeve 5 and the meshing gear ring 9; and when the fixed buffer ring 73 and the movable buffer ring 71 are squeezed, the gas in the buffer groove will be ejected toward the side walls of the synchronous gear 4 and the meshing gear ring 9, so that when shifting, a flow of wind can act on the synchronous gear 4 and the meshing gear ring 9. The side walls of the step gear 4 and the meshing gear ring 9 can not only clean the difficult-to-flow lubricating fluid attached to their side walls, but also have a certain heat dissipation effect on the side walls of the synchronous gear 4 and the meshing gear ring 9; and when the speed change gear sleeve 5 is about to fit with the side wall close to the first output gear 2 or the second output gear 3, the side wall of the speed change gear sleeve 5 will resist the extrusion ring 76, so that the gas in the extrusion groove is filled into the inner cavity of the locking groove, and then the locking block 74 has a tendency to extend outward, so that the fixed buffer ring 73 can fit closely with the side wall of the buffer groove, so that the synchronous gear 4 and the first output gear 2 or the second output gear 3 can quickly achieve common speed, and then the pause feeling that occurs when the gearbox shifts gears can be reduced, thereby improving the continuity of the gearbox shifting.

[0047] Reference Figure 5 , Figure 6 , wherein a rotating cavity 41 is provided on both sides of the synchronous gear 4, the heat dissipation assembly 8 includes a driving blade 81, the driving blade 81 is fixedly connected to the side wall of the rotating cavity 41, a connecting hole 82 is provided on the side wall of the synchronous gear 4, and a connecting cavity 91 is provided on the side of the meshing gear ring 9 close to the synchronous gear 4, and the connecting cavity 91 is the same size as the rotating cavity 41;

[0048] Reference Figure 4 , Figure 5 , wherein the inner wall of the connection cavity 91 is provided with heat dissipation holes 83 at equal intervals, and the output end of the heat dissipation hole 83 is arranged on the side wall of the meshing end of the first output gear 2 and the second output gear 3;

[0049] Through the arrangement of the above structure, when the synchronous gear 4 and the first output gear 2 or the second output gear 3 achieve the same speed, the speed change gear sleeve 5 continues to move and will mesh with the meshing gear ring 9, thereby completing the gear shifting. At this time, the connecting cavity 91 and the rotating cavity 41 will fit together, and the synchronous gear 4 will drive the driving blade 81 to rotate, so that the gas and lubricating fluid in the gearbox enter from the connecting hole 82, pass through the connecting cavity 91 and the rotating cavity 41, and are finally discharged from the heat dissipation hole 83, thereby achieving heat dissipation of the side walls of the meshing ends of the first output gear 2 and the second output gear 3.

[0050] Reference Figure 1-8 , the assembly method of the internal gear buffer connection structure for the new energy vehicle gearbox, the steps are as follows:

[0051] S1. When shifting, the shift lever 6 is pulled by the gear lever inside the vehicle to make the speed gear sleeve 5 slide. When the speed gear sleeve 5 is shifting to the first output gear 2 or the second output gear 3, the fixed buffer ring 73 will first contact the movable buffer ring 71. At this time, the buffer spring 72 will reduce the impact force generated when the speed gear sleeve 5 is meshed with the meshing gear ring 9.

[0052] S2. When the fixed buffer ring 73 and the movable buffer ring 71 are squeezed, the gas in the buffer groove will be ejected toward the side walls of the synchronous gear 4 and the meshing gear ring 9. When shifting gears, a stream of wind can act on the side walls of the synchronous gear 4 and the meshing gear ring 9, thereby not only cleaning the lubricating liquid that is difficult to flow attached to the side walls, but also having a certain heat dissipation effect on the side walls of the synchronous gear 4 and the meshing gear ring 9. In addition, the air in the inner cavity of the buffer groove can also have a certain resistance effect on the movable buffer ring 71, thereby further improving the buffering effect generated when the fixed buffer ring 73 contacts the movable buffer ring 71, thereby further improving the protection effect of the speed change gear sleeve 5 when shifting gears;

[0053] S3. When the speed gear sleeve 5 is about to fit with the side wall close to the first output gear 2 or the second output gear 3, the side wall of the speed gear sleeve 5 will resist the extrusion ring 76, causing the extrusion ring 76 to slide into the extrusion groove, thereby squeezing the gas in the extrusion groove. Since the extrusion groove is connected to the inner cavity of the locking groove, the squeezed gas will be filled into the inner cavity of the locking groove, thereby causing the locking block 74 to have a tendency to extend outward, thereby enabling the locking block 74 to fit closely with the side wall of the buffer groove, thereby improving the friction effect between the fixed buffer ring 73 and the buffer groove, and effectively avoiding relative sliding between the fixed buffer ring 73 and the buffer groove, thereby enabling the synchronous gear 4 to quickly achieve the same speed with the first output gear 2 or the second output gear 3, thereby reducing the pause feeling when the gearbox shifts, thereby improving the continuity of the gearbox shift;

[0054] S4. When in the neutral state, the synchronous gear 4 will drive the driving blades 81 on both sides to rotate, thereby accelerating the flow rate of gas and lubricating fluid on both sides of the synchronous gear 4, and making it move to the first output gear 2 and the second output gear 3 on both sides at the same time, so as to remove the relatively viscous lubricating oil attached to the first output gear 2 and the second output gear 3, and make the lubricating oil with good fluidity in other places converge here, thereby improving the lubrication effect of the side walls of the first output gear 2 and the second output gear 3, and at the same time, the accelerated airflow can also play a role in heat dissipation on the side walls of the first output gear 2 and the second output gear 3; when the synchronous gear 4 is ... of the synchronous gear 4 will drive the driving blades 81 on both sides of the synchronous gear 4, and make it move to the first output gear 2 and the second output gear 3 on both sides at the same time, so as to remove the relatively viscous lubricating oil attached to the first output gear 2 and the second output gear 3, and make the lubricating oil with good fluid After the gear 4 achieves the same speed as the first output gear 2 or the second output gear 3, the speed change gear sleeve 5 continues to move and will mesh with the meshing gear ring 9, thereby completing the gear shifting. At this time, the connecting cavity 91 and the rotating cavity 41 will fit together, and the synchronous gear 4 will drive the driving blade 81 to rotate in the connecting cavity 91, so that the gas and lubricating fluid in the gearbox enter from the connecting hole 82, pass through the connecting cavity 91 and the rotating cavity 41, and are finally discharged from the heat dissipation hole 83, thereby realizing the circulation of the oil on the side wall of the meshing end of the first output gear 2 and the second output gear 3, and also dissipating the heat of the meshing end side wall at the same time.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An internal gear buffer connection structure for a new energy vehicle gearbox, characterized in that: include: An output shaft (1), the left side of the output shaft (1) being rotatably connected to a first output gear (2) via a bearing, the right side of the output shaft (1) being rotatably connected to a second output gear (3) via a bearing, the middle of the output shaft (1) being fixedly connected to a synchronous gear (4), the side wall of the synchronous gear (4) being meshingly connected to a speed change gear sleeve (5), and the side wall of the speed change gear sleeve (5) being fixedly connected to a shift lever (6); A buffer assembly (7), wherein the buffer assembly (7) is mounted on both sides of the speed change gear sleeve (5), and the buffer assembly (7) is used to reduce the impact force generated when the speed change gear sleeve (5) and the synchronous gear (4) are meshed, and can quickly enable the synchronous gear (4) and the first output gear (2) or the second output gear (3) to achieve the same speed; a heat dissipation assembly (8), wherein a power end of the heat dissipation assembly (8) is mounted on both sides of the synchronous gear (4), and an output end of the heat dissipation assembly (8) is mounted on the side walls of the first output gear (2) and the second output gear (3), and the heat dissipation assembly (8) is used to reduce the heat generated when the first output gear (2) or the second output gear (3) meshes and rotates with the engine gear; Buffer grooves are provided on both sides of the speed gear sleeve (5); the buffer assembly (7) comprises a movable buffer ring (71); the movable buffer ring (71) is slidably connected to the inner wall of the buffer groove; a buffer spring (72) is fixedly connected between the side wall of the movable buffer ring (71) and the inner wall of the buffer groove; and the buffer groove is communicated with the inner ring of the speed gear sleeve (5); A fixed buffer ring (73) is fixedly connected to one side of the first output gear (2) and the second output gear (3) close to the speed gear sleeve (5); locking grooves are provided at equal intervals on the side wall of the fixed buffer ring (73); a locking block (74) is slidably connected to the inner cavity of the locking groove; and a return spring (75) is fixedly connected between the bottom of the locking block (74) and the locking groove; An extrusion groove is provided on a side of the first output gear (2) and the second output gear (3) close to the speed gear sleeve (5), and an extrusion ring (76) is slidably connected inside the extrusion groove. The extrusion ring (76) is aligned with the upper edge of the side wall of the speed gear sleeve (5), and the extrusion ring (76) is located outside the fixed buffer ring (73). The extrusion groove is in communication with the inner cavity of the locking groove.

2. The internal gear buffer connection structure for a new energy vehicle gearbox according to claim 1 is characterized in that: The fixed buffer ring (73) is aligned with the movable buffer ring (71), the fixed buffer ring (73) is slidably connected to the inner wall of the buffer groove, the outer diameter of the fixed buffer ring (73) is equal to the inner diameter of the buffer groove, and the length of the fixed buffer ring (73) is less than the maximum retracted length of the buffer spring (72).

3. The internal gear buffer connection structure for a new energy vehicle gearbox according to claim 2 is characterized in that: The width of the speed gear sleeve (5) is greater than that of the synchronous gear (4), and the speed gear sleeve (5) can slide with the side wall of the synchronous gear (4), and the first output gear (2) and the second output gear (3) are fixedly connected to a meshing gear ring (9) on one side close to the speed gear sleeve (5).

4. The internal gear buffer connection structure for a new energy vehicle gearbox according to claim 3 is characterized in that: The meshing gear ring (9) has the same outer diameter as the synchronous gear (4); the meshing gear ring (9) is meshingly connected with the inner wall of the speed change gear sleeve (5); and the speed change gear sleeve (5) can slide with the side wall of the meshing gear ring (9).

5. The internal gear buffer connection structure for a new energy vehicle gearbox according to claim 4 is characterized in that: Rotating cavities (41) are provided on both sides of the synchronous gear (4); the heat dissipation assembly (8) comprises a driving blade (81); the driving blade (81) is fixedly connected to a side wall of the rotating cavity (41); a connecting hole (82) is provided on the side wall of the synchronous gear (4); and a connecting cavity (91) is provided on a side of the meshing gear ring (9) close to the synchronous gear (4); and the connecting cavity (91) and the rotating cavity (41) are of the same size.

6. The internal gear buffer connection structure for a new energy vehicle gearbox according to claim 5, characterized in that: The inner wall of the connection cavity (91) is provided with heat dissipation holes (83) at equal intervals, and the output ends of the heat dissipation holes (83) are arranged on the side walls of the meshing ends of the first output gear (2) and the second output gear (3).

7. Assembly method of internal gear buffer connection structure for new energy vehicle gearbox, characterized in that: The assembly method utilizes the internal gear buffer connection structure for a new energy vehicle gearbox according to claim 6, and the steps are as follows: S1. When shifting, the shift lever (6) is pulled by the gear lever inside the vehicle, so that the speed gear sleeve (5) slides. When the speed gear sleeve (5) shifts toward the first output gear (2) or the second output gear (3), the fixed buffer ring (73) first contacts the movable buffer ring (71). At this time, the buffer spring (72) acts to reduce the impact force generated when the speed gear sleeve (5) meshes with the meshing gear ring (9). S2. When the fixed buffer ring (73) and the movable buffer ring (71) are squeezed, the gas in the buffer groove will be ejected toward the side walls of the synchronous gear (4) and the meshing gear ring (9). When shifting gears, a stream of wind can act on the side walls of the synchronous gear (4) and the meshing gear ring (9), thereby not only cleaning the lubricating fluid that is difficult to flow attached to the side walls, but also achieving a certain heat dissipation effect on the side walls of the synchronous gear (4) and the meshing gear ring (9); S3. When the speed change gear sleeve (5) is about to fit with the side wall close to the first output gear (2) or the second output gear (3), the side wall of the speed change gear sleeve (5) will resist the extrusion ring (76), so that the gas in the extrusion groove is filled into the inner cavity of the locking groove, and the locking block (74) has a tendency to extend outward, so that the fixed buffer ring (73) can fit closely with the side wall of the buffer groove, so that the synchronous gear (4) and the first output gear (2) or the second output gear (3) can quickly achieve the same speed, and thus the pause feeling when the gearbox shifts can be reduced, thereby improving the consistency of the gearbox shifting; S4. When the synchronous gear (4) and the first output gear (2) or the second output gear (3) achieve the same speed, the speed change gear sleeve (5) continues to move and meshes with the meshing gear ring (9), thereby completing the gear shifting. At this time, the connecting cavity (91) and the rotating cavity (41) are in contact with each other, and the synchronous gear (4) drives the driving blade (81) to rotate, so that the gas and lubricating fluid in the gearbox enter from the connecting hole (82), pass through the connecting cavity (91) and the rotating cavity (41), and are finally discharged from the heat dissipation hole (83), thereby achieving heat dissipation of the side wall of the meshing end of the first output gear (2) and the second output gear (3).

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