CN112943921B - Two-gear power assembly system capable of adaptively shifting gears - Google Patents

Abstract

The invention discloses a two-gear power assembly system for adaptive shifting, which belongs to the technical field of power assembly; a two-gear power assembly system for adaptive shifting is characterized in that: it includes an installation housing, the A two-speed transmission is installed inside the installation housing, the two-speed transmission includes a bevel gear transmission input shaft and an output shaft, the top of the installation housing is fixedly connected with a mounting frame, and the bevel gear transmission input shaft and output shaft They are all rotatably connected to the mounting frame, a synchronizer is installed on the output shaft, and an automatic shift mechanism is installed on one side of the installation housing, and the automatic shift mechanism includes an automatic shift control mechanism and an automatic shift execution mechanism. Mechanism; the present invention realizes the smooth shifting of the two-speed transmission, minimizes the impact caused by shifting, and greatly improves the life of the automatic shifting mechanism. The structure is simple, and the shifting can be realized by changing the pitch. Precise control of lever displacement.

Description

A two-speed powertrain system with adaptive shifting

technical field

The invention relates to the technical field of powertrain, in particular to a two-speed powertrain system for adaptive shifting.

Background technique

At present, the powertrain of the motor drive system we have seen either uses a reducer for speed regulation, or uses electronic stepless speed regulation, and does not use gearboxes for speed regulation as widely as fuel vehicles. It is believed that the powertrain of the electric motor drive system does not need a gearbox. Part of the reason is that most of the current motor-driven system powertrains use light-load conditions, and another part of the reason is that there is no gearbox that matches the high-speed motor. For example, it is required that the impact should be small when switching gears at high speed.

As we all know, compared with the engine of a fuel vehicle, the motor in the motor drive system does have a higher limit speed. When it is not heavy-loaded and low-speed, the motor has good working performance, but when it is high-speed and heavy-loaded Under certain circumstances, the performance of the motor is obviously reduced, so the introduction of a transmission in the powertrain of the motor drive system can greatly increase the application range of the powertrain of the motor drive system. Therefore, we propose a two-way adaptive shifting block powertrain system.

Contents of the invention

1, the technical problem to be solved in the present invention

The technical problem to be solved by the present invention is to overcome the defects in the prior art, and now provides a two-speed powertrain system with adaptive shifting, which realizes the smooth shifting of the two-speed transmission and minimizes the shifting time. The impact brought by the shift, and the cooperation between the centrifugal mechanism and the travel switch is used to realize automatic shifting, which greatly improves the life of the automatic shifting mechanism. At the same time, the threaded screw used has a good self-locking effect, There is no need to design a new shift self-locking mechanism, the structure is simple, and the precise control of the displacement of the shift lever can be realized by changing the pitch, and the limit switch used avoids excessive shifting.

2. Technical solution

To achieve the above object, the present invention provides the following technical solutions:

A two-speed powertrain system for adaptive shifting, including an installation housing, a two-speed transmission is installed inside the installation housing, the two-speed transmission includes a bevel gear transmission input shaft and an output shaft, the The top of the installation shell is fixedly connected with a mounting frame, the input shaft and output shaft of the bevel gear transmission are both rotatably connected to the mounting frame, a synchronizer is installed on the output shaft, and an automatic changer is installed on one side of the mounting shell. The automatic shifting mechanism includes an automatic shifting control mechanism and an automatic shifting actuator, the automatic shifting control mechanism is connected with the input shaft of the bevel gear transmission, and the automatic shifting actuator is connected with the synchronizer connected, the automatic shift control mechanism is electrically connected with the automatic shift actuator.

Preferably, a low-speed bull gear and a high-speed pinion are respectively arranged on both sides of the synchronizer, and both the low-speed bull gear and the high-speed pinion are fixedly connected to the output shaft; the input shaft of the bevel gear transmission is fixedly connected to a low-speed pinion and the high-speed bull gear, the low-speed bull gear is meshed with the low-speed pinion, and the high-speed pinion is meshed with the high-speed bull gear.

Preferably, the synchronizer includes an engaging sleeve, a first diaphragm spring, a second diaphragm spring, a low-speed friction disc and a high-speed friction disc, the engaging sleeve is sleeved on the output shaft, the first diaphragm spring and the The second diaphragm spring is sleeved on both sides of the adapter sleeve respectively.

Preferably, the low-speed friction disc is fixedly connected to the side of the low-speed large gear, the high-speed friction disc is fixedly connected to the side of the high-speed pinion, and both sides of the sleeve are fixedly connected to meshing toothed discs. The low-speed friction disc The middle position of the disc and the high-speed friction disc is provided with an engaging tooth groove, and the engaging tooth disc matches the engaging tooth groove; when the engaging tooth disc of the engaging sleeve meshes with the engaging tooth groove of the low-speed friction disc, the two gears The transmission realizes low-speed shifting; when the meshing teeth of the engaging sleeve mesh with the meshing tooth grooves of the high-speed friction discs, the two-speed transmission realizes high-speed shifting.

Preferably, the automatic shift control mechanism includes a main drive motor, a first bevel gear and a second bevel gear, the output shaft of the main drive motor is fixedly connected to the input shaft of the bevel gear transmission, and the second bevel gear is fixedly connected At the end of the bevel gear transmission input shaft away from the low-speed pinion, the first bevel gear is engaged with the second bevel gear, and the first bevel gear is fixedly connected with the bevel gear transmission output shaft. The sleeve is connected with a moving sleeve, and the top end of the moving sleeve is rotatably connected with a lower connecting rod. The end of the lower connecting rod far away from the moving sleeve is rotatably connected with an upper connecting rod. At the top of the shaft, a centrifugal ball is fixedly connected to the end of the upper connecting rod far away from the output shaft of the bevel gear transmission, and a control rod is also connected to the moving sleeve, and the end of the control rod far away from the moving sleeve is connected to a travel switch.

Preferably, the automatic shifting actuator includes a shifting motor, the output shaft of the shifting motor is fixedly connected with a trapezoidal threaded lead screw, and a threaded sleeve is screwed on the trapezoidal threaded lead screw, and the threaded A shift lever is fixedly connected to the sleeve, and a shift fork is fixedly connected to the end of the shift lever away from the threaded sleeve. The shift fork is inserted into the groove on the adapter sleeve, and the shift lever A round ball is embedded in the fork.

Preferably, a first limit switch and a second limit switch are fixedly installed on one side of the shift lever, and a first connecting line is fixedly connected to the first limit switch and the second limit switch, and the first limit switch and the second limit switch are fixedly connected to each other. One end of the connecting wire away from the first limit switch and the second limit switch is fixedly connected to the shift motor, and the first limit switch and the second limit switch cooperate with the position of the shift lever to achieve Intelligent start and stop of the shift motor when the shift is in place.

Preferably, the shifting motor is used to drive the automatic shifting actuator, the automatic shifting control mechanism is used to control the shifting motor, and the automatic shifting actuator is used to contact and push the engaging Set of sports.

Preferably, the shift motor is also fixedly connected with a second connecting wire, and the end of the second connecting wire away from the shift motor is fixedly connected to the travel switch, and the speed of the output shaft of the bevel gear transmission changes, and the The positions of the control rod and the travel switch change, thereby changing the contact position of the travel switch, and then controlling the forward and reverse rotation of the shift motor.

3. Beneficial effects

(1) The self-adaptive shifting two-speed powertrain system provided by the present invention adopts a mechanical centrifugal mechanism to realize automatic shifting between two gears, which reduces the number of electronic control components involved and makes the two-speed shifting more reliable.

(2) A two-speed powertrain system with adaptive shifting provided by the present invention adopts a brand-new synchronizer for shifting, and applies a driving force to the diaphragm spring through the engaging sleeve. With the slow movement of the diaphragm spring, the friction between the diaphragm spring and the friction plate on the gear is getting bigger and bigger, so that the speed of the shift gear and the speed of the output shaft gradually tend to be consistent, which greatly reduces the friction caused by shifting. shock.

(3) Compared with the previous synchronizer, the synchronizer designed by the present invention needs fewer parts, has a more compact structure and has a longer service life.

(4) When the present invention pushes the shift lever, the movement between the trapezoidal screw and the threaded sleeve is used to push the shift lever, making full use of the self-locking effect of the trapezoidal screw to prevent the shift lever from moving .

(5) The present invention cleverly utilizes the limit switch to limit the correct position of shifting, and the limit switch adopts a mechanical structure, which fully increases the use environment of the powertrain, especially in harsh environments.

(6) The present invention also skillfully utilizes the principle of the thrust ball bearing, which reduces the friction between the shift fork and the synchronizer sleeve when shifting gears, and increases the service life.

Description of drawings

Fig. 1 is the general structure schematic diagram of a kind of self-adaptive shifting two-speed power assembly system that the present invention proposes;

Fig. 2 is a front view of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 3 is a schematic diagram of a synchronizer explosion of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 4 is a schematic structural diagram of a diaphragm spring of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 5 is a schematic structural diagram of the adapter sleeve of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 6 is a schematic diagram of the solid connection structure of a high-speed pinion and a high-speed friction disc of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 7 is a schematic diagram of the solid connection structure of the low-speed large gear and the low-speed friction disc of a two-speed powertrain system for adaptive shifting proposed by the present invention;

Fig. 8 is a schematic diagram of a centrifugal automatic shifting control mechanism of a two-speed powertrain system with adaptive shifting proposed by the present invention;

Fig. 9 is a schematic diagram of an automatic shift actuator of a two-speed powertrain system with adaptive shift proposed by the present invention;

FIG. 10 is a partial schematic diagram of a shift fork of a two-speed powertrain system for adaptive shifting proposed by the present invention.

Explanation of symbols in the figure:

1. Output shaft; 2. Low-speed large gear; 3. First diaphragm spring; 4. Engagement sleeve; 5. Second diaphragm spring; 6. High-speed pinion; 7. First limit switch; 8. Shift gear Rod; 9, threaded sleeve; 10, second limit switch; 11, trapezoidal screw; 12, first connection line; 13, shift motor; 14, second connection line; 15, main drive motor; 16 , travel switch; 17, first bevel gear; 18, second bevel gear; 19, high-speed gear; 20, installation shell; 21, low-speed pinion; 22, input shaft; 23, centrifugal ball; 24, upper connection Rod; 25, lower connecting rod; 26, moving sleeve; 27, output shaft of bevel gear transmission; 28, control rod; 29, meshing tooth plate; 30, meshing tooth groove; 31, shift fork; 32, high-speed friction Disc; 33, low-speed friction disc; 34, round ball.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1:

Please refer to Fig. 1-10, a two-speed powertrain system with adaptive shifting, including an installation housing 20, a two-speed transmission is installed inside the installation housing 20, and the two-speed transmission includes a bevel gear transmission input shaft 22 and the output shaft 1, the top of the installation housing 20 is fixedly connected with a mounting frame, the input shaft 22 of the bevel gear transmission and the output shaft 1 are both rotatably connected on the mounting frame, and a synchronizer is installed on the output shaft 1, and one side of the mounting housing 20 An automatic shifting mechanism is installed, the automatic shifting mechanism includes an automatic shifting control mechanism and an automatic shifting actuator, the automatic shifting control mechanism is connected with the input shaft 22 of the bevel gear transmission, and the automatic shifting actuator is connected with the synchronizer , the electrical connection between the automatic shift control mechanism and the automatic shift actuator.

There are low-speed large gear 2 and high-speed pinion 6 respectively arranged on both sides of the synchronizer, and the low-speed large gear 2 and high-speed pinion 6 are fixedly connected with the output shaft 1; the input shaft 22 of the bevel gear transmission is fixedly connected with the low-speed pinion 21 and the high-speed pinion 6. Bull gear 19, low-speed bull gear 2 is meshed with low-speed pinion 21, and high-speed pinion 6 is meshed with high-speed bull gear 19.

The synchronizer includes an adapter sleeve 4, a first diaphragm spring 3, a second diaphragm spring 5, a low-speed friction disc 33 and a high-speed friction disc 32. The adapter sleeve 4 is sleeved on the output shaft 1, and the first diaphragm spring 3 and The second diaphragm spring 5 is sheathed on both sides of the sleeve 4 respectively.

The low-speed friction disc 33 is fixedly connected to one side of the low-speed large gear 2, the high-speed friction disc 32 is fixedly connected to one side of the high-speed pinion 6, and both sides of the adapter sleeve 4 are fixedly connected to the meshing toothed disc 29, the low-speed friction disc 33 and the high-speed friction disc. The middle position of the disk 32 is provided with an engaging tooth groove 30, and the meshing tooth disk 29 matches the meshing tooth groove 30; when the meshing tooth disk 29 of the adapter sleeve 4 meshes with the meshing tooth groove 30 of the low-speed friction disc 33, the two-speed transmission is realized. Low-speed shifting; when the meshing toothed disc 29 of the adapter sleeve 4 meshes with the meshing tooth groove 30 of the high-speed friction disc 32, the two-speed transmission realizes high-speed shifting.

The automatic shift control mechanism comprises a main drive motor 15, a first bevel gear 17 and a second bevel gear 18, the output rotating shaft of the main drive motor 15 is fixedly connected with the bevel gear transmission input shaft 22, and the second bevel gear 18 is fixedly connected with the bevel gear The transmission input shaft 22 is away from one end of the low-speed pinion 21, the first bevel gear 17 is meshed with the second bevel gear 18, the first bevel gear 17 is fixedly connected with a bevel gear transmission output shaft 27, and the bevel gear transmission output shaft 27 is sleeved There is a moving sleeve 26, the top of the moving sleeve 26 is rotatably connected with a lower connecting rod 25, the end of the lower connecting rod 25 away from the moving sleeve 26 is rotatably connected with an upper connecting rod 24, and one end of the upper connecting rod 24 is rotatably connected to the bevel gear transmission output shaft 27 tops, upper connecting rod 24 is fixedly connected with centrifugal ball 23 away from bevel gear transmission output shaft 27 one end, is also connected with control rod 28 on the moving sleeve 26, and control rod 28 is connected with travel switch 16 far away from moving sleeve 26 one ends.

The automatic shifting actuator includes a shift motor 13, the output shaft of the shift motor 13 is fixedly connected with a trapezoidal thread screw 11, and the trapezoidal thread lead screw 11 is spirally connected with a threaded sleeve 9, and the threaded sleeve 9 is fixedly connected There is a shift lever 8, and one end of the shift lever 8 away from the threaded sleeve 9 is fixedly connected with a shift fork 31, the shift fork 31 is plugged into the groove on the adapter sleeve 4, and the shift fork 31 is embedded There are round balls 34.

A first limit switch 7 and a second limit switch 10 are fixedly installed on one side of the shift lever 8, and a first connecting line 12 is fixedly connected to the first limit switch 7 and the second limit switch 10, and the first connecting line 12 The end away from the first limit switch 7 and the second limit switch 10 is fixedly connected to the shift motor 13, and the first limit switch 7 and the second limit switch 10 cooperate with the position of the shift lever 8 to achieve The intelligent start and stop of the gearshift motor 13 when the gearshift is in place.

The shifting motor 13 is used to drive the automatic shifting actuator, the automatic shifting control mechanism is used to control the shifting motor 13, and the automatic shifting actuator is used to contact and push the engaging sleeve 4 to move.

The shift motor 13 is also fixedly connected with a second connecting wire 14, and one end of the second connecting wire 14 away from the shift motor 13 is fixedly connected to the travel switch 16, and the speed of the bevel gear transmission output shaft 27 changes, and the control rod 28 and the stroke The position of the switch 16 changes, thereby changing the change of the contact position of the travel switch 16 , and then controlling the forward and reverse rotation of the shift motor 13 .

A two-speed powertrain system for adaptive shifting provided by the present invention adopts a mechanical centrifugal mechanism to realize automatic shifting between two gears, which reduces the number of electric control components involved and makes two-speed shifting more reliable; adopts a A brand-new synchronizer is used to shift gears, and a driving force is applied to the diaphragm spring through the coupling sleeve; as the diaphragm spring moves slowly, the friction force between the diaphragm spring and the friction plate on the gear becomes larger and larger, thereby making the shift The speed of the gear gear and the speed of the output shaft gradually tend to be consistent, which greatly reduces the impact caused by shifting gears; compared with the previous synchronizer, the synchronizer designed by the present invention requires fewer parts, has a more compact structure, and has a longer service life. Long; when pushing the shift lever, the movement between the trapezoidal threaded screw and the threaded sleeve is used to push the shifting lever, making full use of the self-locking effect of the trapezoidal threaded screw to prevent the shifting of the shifting lever; at the same time The limit switch is cleverly used to limit the correct position of shifting, and the limit switch adopts a mechanical structure, which fully increases the use environment of the powertrain, especially in harsh environments; furthermore, the present invention also cleverly The principle of thrust ball bearing is fully utilized, which reduces the friction between the shift fork and the synchronizer sleeve during shifting, and increases the service life.

Example 2:

Please refer to Figures 1-10, the difference in the basis of the combined embodiment 1 is that,

When the present invention is working, at first the main drive motor 15 is started. At the beginning, the main drive motor 15 is in a low-speed state. Mesh, the centrifugal governor mechanism rotates, but because the rotating speed is not high, the travel switch 16 has no contact, the shift motor 13 does not work, and the transmission output shaft 1 is in a low-speed state at this moment.

Then, as the rotating speed of the main drive motor 15 increases, the centrifugal force of the centrifugal speed regulating mechanism increases, and then drives the control rod 28 of the travel switch 16 to move. The control rod 28 is just in contact with the upper contact point. At this time, the shift motor 13 is rotating forward, and the shift fork 31 on the shift rod 8 is driven by the trapezoidal threaded screw 11 to move, and the shift fork 31 pushes the synchronizer to move, thereby The state of the synchronizer is that the meshing toothed disc 29 of the adapter sleeve 4 meshes with the meshing tooth groove 30 of the high-speed friction disc 32, and then drives the rotation of the high-speed pinion 6. At this time, it indicates that the shift is in place, and the shift lever 8 pushes the second gear. The limit switch 10 makes the contacts of the second limit switch 10 disconnected, and the shift motor 13 stops rotating, so that the shift process from low speed to high speed ends.

Finally, when the main drive motor 15 is turned off, the rotating speed of the main drive motor 15 decreases, and the centrifugal force generated by the centrifugal speed regulating mechanism decreases at this time, and the control rod 28 of the travel switch 16 moves down, and finally contacts with the lower contact point, The shifting motor 13 is reversed, and the shift fork 31 on the shift lever 8 is driven by the trapezoidal screw 11 to move, and the shift fork 31 pushes the synchronizer to move, so that the state of the synchronizer is the meshing teeth of the adapter sleeve 4 The disc 29 meshes with the meshing tooth groove 30 of the low-speed friction disc 33, and then drives the rotation of the low-speed large gear 2. At this time, it indicates that the shift is in place, and the shift lever 8 pushes the first limit switch 7, so that the first limit switch 7 The contacts of the two motors are disconnected, and the shifting motor 13 stops rotating. So far, the shifting process from high speed to low speed ends, and both motors stop rotating. At the same time, it is guaranteed that the automatic transmission is in the low gear state, and it is ready for the next operation.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Equivalent replacements or changes thereof shall fall within the protection scope of the present invention.

Claims (5)

1. A two-speed powertrain system for adaptive shifting, characterized in that: it includes an installation housing (20), and a two-speed transmission is installed inside the installation housing (20), and the two-speed transmission includes There is a bevel gear transmission input shaft (22) and an output shaft (1), and the top of the installation housing (20) is fixedly connected with a mounting frame, and the bevel gear transmission input shaft (22) and the output shaft (1) both rotate Connected to the mounting bracket, a synchronizer is installed on the output shaft (1), and an automatic shift mechanism is installed on one side of the installation housing (20), and the automatic shift mechanism includes an automatic shift control mechanism and An automatic shifting actuator, the automatic shifting control mechanism is connected with the bevel gear transmission input shaft (22), the automatic shifting actuator is connected with the synchronizer, the automatic shifting control mechanism is connected with the automatic shifting execution Electrical connection between institutions; The synchronizer includes an engaging sleeve (4), a first diaphragm spring (3), a second diaphragm spring (5), a low-speed friction disc (33) and a high-speed friction disc (32), and the engaging sleeve (4 ) is sleeved on the output shaft (1), and the first diaphragm spring (3) and the second diaphragm spring (5) are respectively sleeved on both sides of the adapter sleeve (4); The automatic shift control mechanism includes a main drive motor (15), a first bevel gear (17) and a second bevel gear (18), the output shaft of the main drive motor (15) and the bevel gear transmission input shaft (22 ) is fixedly connected, the second bevel gear (18) is fixedly connected to one end of the bevel gear transmission input shaft (22) away from the low-speed pinion (21), the first bevel gear (17) and the second bevel gear (18) Mesh connection, the first bevel gear (17) is fixedly connected with a bevel gear transmission output shaft (27), the bevel gear transmission output shaft (27) is sleeved with a moving sleeve (26), and the moving sleeve The top of the tube (26) is rotatably connected with a lower link (25), the end of the lower link (25) away from the moving sleeve (26) is rotatably connected with an upper link (24), and one end of the upper link (24) Rotationally connected to the top of the bevel gear transmission output shaft (27), the end of the upper connecting rod (24) away from the bevel gear transmission output shaft (27) is fixedly connected with a centrifugal ball (23), and the moving sleeve (26) also A control rod (28) is connected, and the end of the control rod (28) away from the moving sleeve (26) is connected with the travel switch (16); The automatic shifting actuator includes a shift motor (13), the output shaft of the shift motor (13) is fixedly connected with a trapezoidal screw (11), and the trapezoidal screw (11) is screwed A threaded sleeve (9) is connected, and a shift rod (8) is fixedly connected to the threaded sleeve (9), and a shift dial is fixedly connected to the end of the shift rod (8) away from the threaded sleeve (9). Fork (31), the shift fork (31) is plugged into the groove on the adapter sleeve (4), and a round ball (34) is embedded in the shift fork (31); A first limit switch (7) and a second limit switch (10) are fixedly installed on one side of the shift lever (8), and the first limit switch (7) and the second limit switch (10) A first connection line (12) is fixedly connected to the top, and one end of the first connection line (12) away from the first limit switch (7) and the second limit switch (10) is fixedly connected to the shift motor (13) , the first limit switch (7) and the second limit switch (10) cooperate with the position of the shift lever (8), so as to achieve the intelligence of the shift motor (13) when the shift is in place. Start and stop. 2. A two-speed powertrain system for adaptive shifting according to claim 1, characterized in that: a low-speed large gear (2) and a high-speed pinion (6) are respectively arranged on both sides of the synchronizer, The low-speed bull gear (2) and the high-speed pinion (6) are fixedly connected with the output shaft (1); the bevel gear transmission input shaft (22) is fixedly connected with the low-speed pinion (21) and the high-speed bull gear ( 19), the low-speed bull gear (2) is meshed with the low-speed pinion (21), and the high-speed pinion (6) is meshed with the high-speed bull gear (19). 3. A two-speed powertrain system with adaptive shifting according to claim 1, characterized in that: the low-speed friction disc (33) is fixedly connected to one side of the low-speed gear (2), and the high-speed The friction disc (32) is fixedly connected to one side of the high-speed pinion (6), and both sides of the adapter sleeve (4) are fixedly connected with an engaging toothed disc (29), and the low-speed friction disc (33) and the high-speed friction disc The middle position of (32) is provided with meshing tooth groove (30), and described meshing tooth plate (29) matches with meshing tooth groove (30); When the meshing tooth grooves (30) of the discs (33) are meshed, the two-speed transmission realizes low-speed shifting; (30) When the two gears are engaged, the two-speed transmission realizes high-speed gear shifting. 4. A two-speed powertrain system with adaptive shifting according to claim 1, characterized in that: the shifting motor (13) is used to drive the automatic shifting actuator, and the automatic shifting The gear control mechanism is used to control the gear shift motor (13), and the automatic gear shift actuator is used to contact and push the engagement sleeve (4) to move. 5. A two-speed powertrain system for adaptive shifting according to claim 1, characterized in that: said shifting motor (13) is also fixedly connected with a second connection line (14), said The end of the second connection line (14) away from the shift motor (13) is fixedly connected to the travel switch (16), the speed of the bevel gear transmission output shaft (27) changes, and the control rod (28) is connected to the The position of the travel switch (16) changes, thereby changing the change of the contact position of the travel switch (16), and then controlling the forward and reverse rotation of the shift motor (13).

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