Transmission based on synchronizer gear shifting and vehicle

Abstract

The invention belongs to the technical field of transmissions, and provides a transmission based on synchronizer gear shifting and a vehicle. The transmission based on synchronizer gear shifting comprises a four-gear gear shifting device, an input shaft assembly and an output shaft assembly. The four-gear shifting device comprises a shifting drum, a first synchronizer, a second synchronizer, a first driving mechanism, a second driving mechanism, a rotating shaft and a motor; the first driving mechanism and the second driving mechanism are in sliding connection with the gear shifting drum; the first driving mechanism and the second driving mechanism are respectively used for driving the first synchronizer and the second synchronizer to perform gear shifting operation; the motor is used for driving the gear shifting drum to rotate so that the gear shifting area can drive the first driving mechanism and the second driving mechanism to move back and forth in the axial direction of the gear shifting drum. The input shaft assembly is used for transmitting power generated by an automobile to the output shaft assembly through the input shaft assembly. The number of executing mechanisms for gear shifting is small, and the gear engaging action is simple and reliable.

Description

[0001] This invention is a divisional application of the invention patent application filed on September 28, 2021, with the invention name of "Transmission four-speed shifting device, transmission and vehicle" and application number 2021111432899. Technical Field

[0002] The invention belongs to the technical field of transmissions, and in particular relates to a transmission and a vehicle based on synchronizer shifting. Background Art

[0003] With the popularity of cars in people's lives, they have become an indispensable and important tool for people to travel and work. In order to make the power output of the car's power device adapt to different driving needs, the transmission often sets multiple gears for users to choose from, and different gears can output different torques and speeds. In order to conveniently switch between different gears, a shifting device is required. Due to the large number of gears, the current shifting device often requires multiple motors and multiple shift drums to achieve switching between multiple gears, which makes the mechanism for performing the shifting action too much, which is not only costly and complex, but also reduces reliability. Summary of the invention

[0004] In view of this, the present invention provides a transmission and a vehicle based on synchronizer shifting to solve the technical problems of the existing multi-speed shifting device having multiple actuators and complex shifting operations.

[0005] The technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a transmission based on synchronizer shifting, comprising:

[0007] A four-speed shift device, the four-speed shift device includes a shift drum, a first synchronizer, a second synchronizer, a first drive mechanism, a second drive mechanism, a rotating shaft and a motor, the shift drum is cylindrical, a guide groove extending along its circumferential direction is provided on the cylindrical peripheral wall of the shift drum, the guide groove includes a shift area that rotates to different angular positions with the shift drum, the first drive mechanism and the second drive mechanism are arranged on both sides of the shift drum axis direction and are slidably connected to the shift drum, the first synchronizer and the second synchronizer are arranged on both sides of the shift drum axis direction, and the first synchronizer and the second synchronizer are both provided with a gear engaging component , the gear engaging component is a synchronizing ring of a first synchronizer or a second synchronizer, the first driving mechanism and the second driving mechanism are respectively used to drive the first synchronizer and the second synchronizer to perform a gear shifting operation, the motor is used to drive the shift drum to rotate so that the shift area drives the first driving mechanism and the second driving mechanism to move back and forth along the axial direction of the shift drum, the rotating shaft and the shift drum are interference fit, the motor is synchronously connected to the rotating shaft, the motor drives the rotating shaft to rotate, and the rotating shaft drives the shift drum to rotate so that the shift area drives the first driving mechanism and the second driving mechanism to move back and forth along the axial direction of the shift drum;

[0008] An input shaft assembly, the input shaft assembly comprising an input shaft, a first gear input gear, a second gear input gear, a third gear input gear and a fourth gear input gear, the first synchronizer is connected to the input shaft for synchronous rotation, the first gear input gear, the third gear input gear, the fourth gear input gear and the second gear input gear are arranged in sequence along the axial direction of the input shaft;

[0009] An output shaft assembly, the output shaft assembly includes an output shaft, a first gear output gear, a second gear output gear, a third gear output gear and a fourth gear output gear, the second synchronizer is connected to the output shaft for synchronous rotation, and the first gear output gear, the third gear output gear, the fourth gear output gear and the second gear output gear are arranged in sequence along the axial direction of the output shaft.

[0010] Preferably, the first driving mechanism includes a first sliding member, a first fork and a first connecting member, the first connecting member is respectively connected to the first sliding member and the first fork, and the first sliding member slides along the guide groove; the second driving mechanism includes a second sliding member, a second fork and a second connecting member, the second connecting member is respectively connected to the second sliding member and the second fork, and the second sliding member slides along the guide groove; an annular limiting groove is provided on the peripheral wall of the first synchronizer and the second synchronizer.

[0011] Preferably, the guide groove on the shift drum is provided with a first angular position and a second angular position along the circumferential direction, the first drive mechanism is connected to the first angular position of the guide groove via a first sliding member, and the second drive mechanism is connected to the second angular position of the guide groove via a second sliding member, and the first angular position is different from the second angular position.

[0012] Preferably, the area outside the shift zone in the guide groove is a neutral zone, and when the first drive mechanism and the second drive mechanism are connected to the neutral zone, the first synchronizer and the second synchronizer are in a neutral state; the first drive mechanism, driven by the shift zone, pushes the gear engaging component of the first synchronizer to move along the axial direction of the first synchronizer to the first axial position to engage in gear, or pushes the gear engaging component of the first synchronizer to move along the axial direction of the first synchronizer to the second axial position to engage in gear, wherein the first axial position is different from the second axial position; the second drive mechanism is used to push the gear engaging component of the second synchronizer to move along the axial direction of the second synchronizer to the third axial position to engage in gear, or pushes the gear engaging component of the second synchronizer to move along the axial direction of the second synchronizer to the fourth axial position to engage in gear, wherein the third axial position is different from the fourth axial position.

[0013] Preferably, the shifting zone includes a first guide section, a second guide section and a third guide section. When the first driving mechanism is connected to the first guide section, the gear engaging component of the first synchronizer is pushed to a first axial position, and when the first driving mechanism is connected to the second guide section, the gear engaging component of the first synchronizer is pushed to a second axial position; when the second driving mechanism is connected to the first guide section, the gear engaging component of the second synchronizer is pushed to a third axial position, and when the second driving mechanism is connected to the second guide section, the gear engaging component of the second synchronizer is pushed to a fourth axial position; the third guide section is axially placed on the shift drum at the same height as the neutral zone, and the first guide section, the third guide section and the second guide section are arranged in sequence.

[0014] Preferably, the first gear input gear meshes with the first gear output gear, the second gear input gear meshes with the second gear output gear, the third gear input gear meshes with the third gear output gear, and the fourth gear input gear meshes with the fourth gear output gear.

[0015] Preferably, the first synchronizer is located between the second gear input gear and the fourth gear input gear, and the gear engaging component on the first synchronizer can be combined with the second gear gear when it moves toward one side along the axial direction, and can be combined with the fourth gear input gear when it moves toward the other side along the axial direction; the second gear input gear is rotationally connected to the input shaft, and the fourth gear input gear is rotationally connected to the input shaft, when the first synchronizer is combined with the second gear input gear, the power of the input shaft is transmitted to the second gear input gear through the first synchronizer, and when the first synchronizer is combined with the fourth gear input gear, the power of the input shaft is transmitted to the fourth gear input gear through the first synchronizer; the first gear input gear and the third gear input gear are synchronously connected and rotated with the input shaft through splines.

[0016] Preferably, the second synchronizer is located between the first gear output gear and the third gear output gear, and the gear engaging component on the second synchronizer can be combined with the first gear output gear when it moves toward one side along the axial direction, and can be combined with the third gear output gear when it moves toward the other side along the axial direction; the first gear output gear is rotationally connected to the output shaft, and the third gear output gear is rotationally connected to the output shaft, when the second synchronizer is combined with the first gear output gear, the power of the first gear output gear is transmitted to the output shaft through the second synchronizer, and when the second synchronizer is combined with the third gear output gear, the power of the third gear output gear is transmitted to the output shaft through the second synchronizer; the second gear output gear and the fourth gear output gear are connected to the output shaft through splines, and rotate synchronously with the output shaft.

[0017] Preferably, the input shaft assembly also includes a second bearing and a fourth bearing, the second bearing is arranged on the input shaft, the second gear input gear is rotatably connected to the input shaft through the second bearing, the fourth bearing is arranged on the input shaft, and the fourth gear input gear is rotatably connected to the input shaft through the fourth bearing; the output shaft assembly also includes a first bearing and a third bearing, the first bearing is arranged on the output shaft, the first gear output gear is rotatably connected to the output shaft through the first bearing, the third bearing is arranged on the output shaft, and the third gear output gear is rotatably connected to the output shaft through the third bearing.

[0018] In a second aspect, the present invention provides a vehicle, comprising the transmission four-speed shifting device described in the first aspect.

[0019] Beneficial effects: The transmission and vehicle based on synchronizer shifting of the present invention set the first synchronizer and the second synchronizer on different shaft systems, so that the first synchronizer and the second synchronizer are staggered, so that the two synchronizers will not interfere with each other during gear shifting. Since the first gear and the second gear are staggered, and the second synchronizer is used when the first gear is engaged, and the first synchronizer is used when the second gear is engaged, the first gear and the second gear can be engaged separately without interfering with each other; since the second gear and the third gear are staggered, and the first synchronizer is used when the second gear is engaged, and the second synchronizer is used when the third gear is engaged, the second gear and the third gear can be engaged separately without interfering with each other; since the second synchronizer is used when the third gear is engaged, and the first synchronizer is used when the fourth gear is engaged, the third gear and the fourth gear can be engaged separately without interfering with each other; when the shift area of ​​the shift drum rotates to a position connected to the first drive mechanism, the shift area can be engaged with the shifting. The drum rotates and pushes the first synchronizer through the first drive mechanism to engage two of the gears; when the shift area of ​​the shift drum rotates to a position connected to the second drive mechanism, the shift area can rotate with the shift drum and push the second synchronizer through the second drive mechanism to engage the other two gears; since the areas where the first drive mechanism and the second drive mechanism are connected to the shift drum are at different angular positions, only one shift drum and two drive mechanisms are needed to engage the two gears respectively, and the gear engagement operation of the aforementioned four gears only needs one motor to drive a shift drum to rotate to complete, so there are fewer actuators for shifting, the gear engagement action is simple, and the operation is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0021] Figure 1 It is a three-dimensional structural diagram of the four-speed shifting device of the present invention;

[0022] Figure 2 A diagram showing the relationship between the shifting area of ​​the shift drum of the present invention and the angular positions of the first drive mechanism and the second drive mechanism;

[0023] Figure 3 A three-dimensional structural diagram of the shift drum of the present invention;

[0024] Figure 4 is a relationship diagram between the axial position and the circumferential position of the guide groove of the present invention;

[0025] Figure 5 It is a three-dimensional structural diagram of the cooperation between the first driving mechanism and the shift drum of the present invention;

[0026] Figure 6 It is a three-dimensional structural diagram of the cooperation between the second driving mechanism and the shift drum of the present invention;

[0027] Figure 7 A three-dimensional structural diagram of the first drive mechanism and the first synchronizer of the present invention

[0028] Figure 8 A top view of the structure of the present invention that enables the rotating belt to rotate with the synchronizer;

[0029] Fig. 9 A side view of a structure of the present invention that enables a rotating belt to rotate with a synchronizer;

[0030] Fig.10 is a position relationship diagram of four rotating parts of the present invention;

[0031] Fig.11 The shaft system principle diagram of the transmission of the present invention;

[0032] Fig.12 It is a schematic structural diagram of the output shaft assembly of the transmission of the present invention;

[0033] Fig.13 It is a schematic structural diagram of the input shaft assembly of the transmission of the present invention;

[0034] Fig.14 It is a three-dimensional structural diagram of the transmission flange of the present invention;

[0035] Fig.15 A three-dimensional structural diagram of the transmission flange of the present invention from another perspective;

[0036] Fig.16 A three-dimensional view of a structure in which the transmission flange of the present invention is connected to a transmission shaft;

[0037] Fig.17 It is a side view of the transmission flange of the present invention;

[0038] Fig.18 It is a front view of the transmission flange of the present invention;

[0039] Fig.19 A schematic diagram of the structure of the three sub-transmission structure groups disconnected from each other according to the present invention

[0040] Fig. 20 It is a structural schematic diagram of two groups of sub-transmission structures of the transmission flange of the present invention being staggered in the circumferential direction;

[0041] Description of reference numerals:

[0042] The first synchronizer 2, the second synchronizer 4, the input shaft assembly 80, the first gear input gear 81, the second gear input gear 82, the third gear input gear 83, the fourth gear input gear 84, the input shaft 85, the second bearing 86, the fourth bearing 87, the output shaft assembly 90, the first gear output gear 91, the second gear output gear 92, the third gear output gear 93, the fourth gear output gear 94, the output shaft 95, the first bearing 96, the third bearing 97;

[0043] Shift drum 1, guide groove 11, shift area 111, neutral area 112; first guide section 113, second guide section 114, third guide section 115, first angular position 12, second angular position 13;

[0044] Limiting groove 21, first driving mechanism 3, first sliding member 31, first shift fork 32, first connecting member 33, first rotating member 321, second rotating member 322, third rotating member 323, fourth rotating member 324, shifting member 325, rotating belt 326, second driving mechanism 5, second sliding member 51, second shift fork 52, second connecting member 53; motor 6, rotating shaft 7;

[0045] Flange body 410, first connection part 411, second connection part 412, limiting hole 4121, stopper 4122, first transmission structure 420, first connection structure 430, second transmission structure 440, first sub-transmission structure group 441, second sub-transmission structure group 442, third sub-transmission structure group 443, fourth sub-transmission structure group 444, fifth sub-transmission structure group 445. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0047] A vehicle is a commonly used means of transportation, mainly composed of a power system, a transmission system, a body, a chassis, etc. The transmission system includes a transmission, a drive shaft, a differential, etc. When the vehicle is running, the power of the power system is transmitted to the transmission. The transmission converts the power of the power system and outputs power with suitable torque and speed. The converted power is then transmitted to the drive shaft. After the drive shaft transmits the power to the differential, the differential transmits the power to the wheels on both sides respectively. The converted power can also be transmitted directly to the differential. In order to achieve parking and shifting, the transmission is also provided with a shifting device and a parking device. In order to lubricate the transmission, differential and other devices, a lubrication system is also configured for the transmission, differential and other devices.

[0048] Example 1

[0049] like Figure 1The present embodiment provides a transmission based on synchronizer shifting, which is used for shifting four gears. For the convenience of description, the four gears are divided into two groups, namely the first group of gears and the second group of gears, each group of gears includes two gears. The transmission four-speed shifting device of the present embodiment includes a shift drum 1, a motor 6, a first synchronizer, a first drive mechanism 3, a second synchronizer 4 and a second drive mechanism 5.

[0050] like Figure 2 and Figure 3 As shown, the shift drum 1 is provided with a guide groove 11 extending along its circumferential direction, and the guide groove 11 includes a shift area 111 that rotates to different angular positions with the shift drum 1;

[0051] like Figure 1 As shown, the shift drum 1 can be set to a cylindrical shape, and the aforementioned guide groove 11 can be set on the cylindrical circumferential wall of the shift drum 1. The shift area 111 is a part of the entire guide groove 11. The shift drum 1 can rotate around its own axis, and the shift area 111 also rotates to different positions as the shift drum 1 rotates.

[0052] like Figure 5 As shown, the first synchronizer is used to participate in the gear shifting operation of the first group of gears. The first synchronizer can be connected to the input shaft or the output shaft in synchronous rotation; the first synchronizer is provided with a gear shifting component, which can move along the axial direction of the first synchronizer under the action of external force (for example, under the shifting of the shift fork), and when the gear shifting component of the first synchronizer moves to fully engage with the gear of a certain gear, the first synchronizer rotates synchronously with the gear, and the power of the input shaft can be transmitted to the gear through the first synchronizer, or the power of the gear can be transmitted to the output shaft. The aforementioned synchronous transmission connection refers to a connection method that can make the first synchronizer and the input shaft or the output shaft rotate synchronously.

[0053] The first driving mechanism 3 is slidably connected to the guide groove 11 at the first angular position 12 of the shift drum 1, and the first driving mechanism 3 is used to push the first synchronizer's gear engaging component to move along the axial direction of the first synchronizer to the first axial position to engage in gear, or to push the first synchronizer's gear engaging component to move along the axial direction of the first synchronizer to the second axial position to engage in gear, wherein the first axial position is different from the second axial position;

[0054] The first axial position refers to the position where the gear engaging component of the first synchronizer is fully engaged with the gear of one of the first gear positions and the gear rotates synchronously with it. The second axial position refers to the position where the gear engaging component of the first synchronizer is fully engaged with the gear of another gear position in the first gear position and the gear rotates synchronously with it. The aforementioned gear engaging component may be a synchronizing ring of the first synchronizer.

[0055] As the shift drum 1 rotates, the shift area 111 domain can rotate to an angular position range in which it is slidably connected to the first drive mechanism 3. Within this angular position range, as the shift drum 1 rotates, the position of the shift area 111 domain connected to the first drive also changes continuously. Since the distances between the various positions of the shift area 111 domain and the first synchronizer in the axial direction are different, the shift area 111 can drive the first drive mechanism 3 to move in the axial direction during the rotation process, and the first drive mechanism 3 moves in the axial direction while pushing the first synchronizer's gear engaging component to move in the axial direction.

[0056] In this embodiment, the first driving mechanism 3 includes a first sliding member 31 , a first shift fork 32 and a first connecting member 33 . The first connecting member 33 is connected to the first sliding member 31 and the first shift fork 32 , respectively. The first sliding member 31 slides along the guiding groove 11 .

[0057] The width of the guide groove is slightly larger than the width of the first sliding member 31, and the movement direction of the first connecting member 33 is constrained, and it can only move in the axial direction. Looking along the axial direction of the shift drum 1, the distances of the guide groove 11 from the first synchronizer or the second synchronizer 4 at different circumferential positions in some areas are different. When the shift drum 1 rotates, different positions of the guide groove 11 contact the first sliding member 31, and the sliding member slides in the circumferential direction relative to the guide groove 11, and moves back and forth in the axial direction under the drive of the guide groove 11. Since the first connecting member 33 connects the first sliding member 31 and the first shift fork 32 together, the first shift fork 32 also moves synchronously with the first sliding member 31 in the axial direction. The first connecting member 33 can be arranged on the radial side of the shift drum 1, and the first sliding member 31 is arranged along the radial direction of the shift drum 1. One end of the first sliding member 31 is connected to the first connecting member 33, and the other end opposite to it is embedded in the guide groove 11.

[0058] like Figure 1 and Figure 6 As shown, the second synchronizer 4 is used to participate in the gear operation of the second group of gears, and the second synchronizer 4 can be connected to the input shaft or the output shaft for synchronous rotation; the second synchronizer 4 is provided with a gear engaging component, and the gear engaging component can move along the axial direction of the second synchronizer 4 under the action of an external force (for example, under the shifting of a shift fork), and when the gear engaging component of the second synchronizer 4 moves to fully engage with a gear of a certain gear, the second synchronizer 4 rotates synchronously with the gear, and at this time, the power of the input shaft can be transmitted to the gear through the second synchronizer 4, or the power of the gear can be transmitted to the output shaft. The aforementioned synchronous transmission connection refers to a connection method that can make the second synchronizer 4 and the input shaft or the output shaft rotate synchronously.

[0059] The second driving mechanism 5 is slidably connected to the guide groove 11 at the second angular position 13 of the shift drum 1, and the second driving mechanism 5 is used to push the gear engaging component of the second synchronizer 4 to move to the third axial position to engage in gear along the axial direction of the second synchronizer 4 under the drive of the shifting area 111, or to push the gear engaging component of the second synchronizer 4 to move to the fourth axial position to engage in gear along the axial direction of the second synchronizer 4, wherein the third axial position is different from the fourth axial position, and the second angular position 13 is different from the first angular position 12;

[0060] The third axial position refers to the position where the gear engaging component of the second synchronizer 4 is fully engaged with the gear of one of the second gear positions and the gear rotates synchronously with it. The fourth axial position refers to the position where the gear engaging component of the second synchronizer 4 is fully engaged with the gear of another gear position in the second gear position and the gear rotates synchronously with it. The aforementioned gear engaging component may be a synchronizer ring of the second synchronizer 4.

[0061] As the shift drum 1 rotates, the shift area 111 domain can rotate to an angular position range in which it is slidably connected to the second drive mechanism 5. Within this angular position range, as the shift drum 1 rotates, the position of the shift area 111 domain connected to the second drive also changes continuously. Since the distances between the various positions of the shift area 111 domain and the second synchronizer 4 in the axial direction are different, the shift area 111 can drive the second drive mechanism 5 to move in the axial direction during the rotation process, and the second drive mechanism 5 moves in the axial direction while pushing the gear engaging component of the second synchronizer 4 to move in the axial direction.

[0062] In this embodiment, the second driving mechanism 5 includes a second sliding member 51 , a second shift fork 52 and a second connecting member 53 . The second connecting member 53 is connected to the second sliding member 51 and the second shift fork 52 , respectively. The second sliding member 51 slides along the guiding groove 11 .

[0063] The width of the guide groove is slightly larger than the width of the second sliding member 51, and the movement direction of the second connecting member 53 is constrained, and it can only move in the axial direction. Looking along the axial direction of the shift drum 1, the distances of the guide groove 11 from the first synchronizer or the second synchronizer 4 at different circumferential positions in some areas are different. When the shift drum 1 rotates, different positions of the guide groove 11 contact the second sliding member 51, and the sliding member slides in the circumferential direction relative to the guide groove 11, and moves back and forth in the axial direction under the drive of the guide groove 11. Since the second connecting member 53 connects the second sliding member 51 and the second shift fork 52 together, the second shift fork 52 also moves synchronously with the second sliding member 51 in the axial direction. The second connecting member 53 can be arranged on the radial side of the shift drum 1, and the second sliding member 51 is arranged along the radial direction of the shift drum 1. One end of the second sliding member 51 is connected to the second connecting member 53, and the other end opposite to it is embedded in the guide groove 11.

[0064] like Figure 1 As shown, the motor 6 is used to drive the shift drum 1 to rotate so that the shift area 111 drives the first drive mechanism 3 and the second drive mechanism 5 to move back and forth along the axial direction of the shift drum 1. The motor 6 and the first synchronizer and the second synchronizer 4 are located on both sides of the axial direction of the shift drum 1, and the motor 6 is coaxially arranged with the shift drum 1.

[0065] In this embodiment, the motor 6 and the two driving mechanisms are separated in the axial direction so that they are located on both sides of the shift drum 1. In this way, the actions of the motor 6 and the driving mechanisms do not affect each other, and the coaxial arrangement of the motor 6 and the shift drum 1 can make the structure more compact and also utilize the power transmission between the motor 6 and the shift drum 1.

[0066] As a preferred embodiment, in this embodiment, the transmission four-speed shifting device further includes a rotating shaft 7, the shift drum 1 and the rotating shaft 7 are interference fit, and the motor 6 drives the rotating shaft 7 to rotate to drive the shift drum 1 to rotate. The transmission is directly carried out by using the interference fit between the rotating shaft and the shift drum 1, and the transmission process is simpler and more reliable. The motor 6 is installed on the assembly housing, the shift drum 1 is positioned on the housing through the rotating shaft 7, the shift drum 1 and the shift drum 1 shaft rotating shaft 7 are relatively fixed, and the rotating shaft 7 can rotate on the housing.

[0067] like Figure 7 As shown, in the present embodiment, an annular limiting groove is provided on the peripheral wall of the first synchronizer and / or the second synchronizer 4, and a shifting member 325 is provided at the end of the first shift fork 32 and / or the second shift fork 52, and the shifting member 325 shifts the gear engaging component of the first synchronizer and / or the second synchronizer 4 by shifting the side wall of the limiting groove.

[0068] In this embodiment, the width of the limit groove is greater than 1.1 times the width of the toggle member 325, the distance between the first axial position and the second axial position is greater than 2 times the axial gap between the toggle member 325 and the limit groove, and the distance between the first axial position and the second axial position is greater than 2 times the axial gap between the toggle member 325 and the limit groove. With the above structure, after the toggle member 325 is inserted into the limit groove and the gear engaging component of the synchronizer is toggled to the gear engaging position, one side of the toggle member 325 contacts one side wall of the limit groove, and a sufficient gap is left between the other side of the toggle member 325 and the other side wall of the limit groove. In this way, when an unexpected small vibration causes a relative displacement between the toggle member 325 and the limit groove, the other side of the toggle member 325 will not contact the other side wall of the limit groove, thereby avoiding the toggle member 325 toggling the limit groove due to unexpected vibration, causing the gear engaging component to disengage from the current gear position, thereby making the gear engaging more reliable. When the gear is engaged normally, the distance that the toggle member 325 moves in the axial direction must exceed the axial gap between the toggle member 325 and the limiting groove. Therefore, during the toggle movement, the other side of the toggle member 325 can also push the gear engaging component to move by contacting the other side wall of the limiting groove.

[0069] When the toggle member 325 toggles the synchronizer to shift gears, the toggle member 325 contacts the synchronizer, and the synchronizer is in high-speed rotation, and relative motion occurs between the toggle member 325 and the synchronizer. Therefore, there is continuous sliding friction between the toggle member 325 and the synchronizer. Both the toggle member 325 and the synchronizer are prone to wear and deformation, and the heat generated by friction will also affect the gearbox. For this purpose, replaceable wear-resistant parts can be set on the toggle member 325 to allow the wear-resistant parts to contact the synchronizer. When the wear-resistant parts are worn to a certain extent, new wear-resistant parts can be replaced. When this method is used, the gearbox needs to be disassembled and assembled to replace the wear-resistant parts, so it is very inconvenient in actual use.

[0070] For this purpose, an oil guide groove can be provided on the first shift fork 32, and the outlet of the oil guide groove can be provided on the surface where the shifting member 325 contacts the synchronizer. The lubricating oil flows along the oil guide groove to the surface of the shifting member 325, and an oil film is formed between the shifting member 325 and the synchronizer to reduce the friction between the two.

[0071] In addition, rollers or needle rollers may be provided on the shifting member 325 to reduce friction. However, since the rollers are in point contact with the synchronizer and the needle rollers are in line contact with the synchronizer, the contact areas of these two contact modes are very small, which may easily cause excessive concentration of force on the synchronizer and the shift fork.

[0072] In this regard, this embodiment uses a structure that allows the toggle member 325 to rotate synchronously with the synchronizer to avoid friction. Fig.10As shown, the first shift fork 32 of the present embodiment further includes a cylindrical first rotating member 321, a second rotating member 322, a third rotating member 323 and a fourth rotating member 324, the first rotating member 321, the second rotating member 322, the third rotating member 323 and the fourth rotating member 324 are rotatably connected to the first shift fork 32, and the extension lines of the rotation axes of the first rotating member 321, the second rotating member 322, the third rotating member 323 and the fourth rotating member 324 intersect at the same intersection, and the same intersection is located on the rotation axis of the first synchronizer, the rotation axis of the first rotating member 321 and the rotation axis of the second rotating member 322 are located in a first plane, the rotation axis of the third rotating member 323 and the rotation axis of the fourth rotating member 324 are located in a second plane different from the first plane, and the first plane and the second plane are arranged along the axial direction of the first synchronizer. The toggle member 325 is a rotating belt 326, one end of which is passed around the outer walls of the first rotating member 321, the second rotating member 322, the third rotating member 323 and the fourth rotating member 324 in sequence and then connected to the other end opposite thereto. The rotating belt 326 may be a steel belt or a belt. In the specific implementation, the rotating belt 326 is tightened and then wound around the outer walls of the aforementioned four rotating members, and the rotating belt 326 is connected end to end to form a ring. The rotating belt 326 is in an arc shape after being unfolded. When the distance between the first rotating member 321 and the second rotating member 322 is too long, a fifth rotating member may be arranged between the first rotating member 321 and the second rotating member 322, and the fifth rotating member may be used to provide support for the rotating belt 326 in the middle; when the distance between the third rotating member 323 and the fourth rotating member 324 is too long, a fifth rotating member may be arranged between the first rotating member 321 and the second rotating member 322, and the sixth rotating member may be used to provide support for the rotating belt 326 in the middle. The fifth rotating member and the sixth rotating member may be provided in plurality, and the number of the fifth rotating member and the sixth rotating member may be determined according to the distance between the first rotating member 321 and the second rotating member 322 or the distance between the third rotating member 323 and the fourth rotating member 324. The aforementioned rotating members may be rotatably connected to the first shift fork 32 via a rotating shaft with a smooth surface.

[0073] After adopting the above structure, when the rotating belt 326 moves with the first shift fork 32 to the position in contact with the synchronizer, the rotating belt 326 rotates under the drive of the synchronizer. The rotating direction of the rotating belt 326 is as follows: Figures 8 to 10When the rotating belt 326 just contacts with the synchronizer, there will be sliding friction between the rotating belt 326 and the synchronizer. When the rotating belt 326 and the synchronizer rotate at the same speed, there will be no relative sliding between the rotating belt 326 and the synchronizer, and no sliding friction will be generated to cause wear of the rotating belt 326 and the synchronizer. At this time, the rotating belt 326 rotates around the four rotating parts in sequence under the drive of the synchronizer, and the rotating belt 326 contacts the synchronizer in a surface contact manner, which is not easy to cause excessive concentration of force, and the rotating belt 326 can always rotate synchronously with the synchronizer.

[0074] This embodiment also provides another implementation method for solving the aforementioned sliding friction problem. The first shift fork 32 also includes multiple groups of rotating components, each group of rotating components includes a seventh rotating member, an eighth rotating member and a rotating belt 326, the seventh rotating member and the eighth rotating member are rotatably connected to the first shift fork 32, and one end of the rotating belt 326 successively passes around the outer walls of the seventh rotating member and the eighth rotating member and then connects to the other opposite end. The rotating axes of the seventh rotating member and the eighth rotating member are parallel to each other. The eighth rotating member and the ninth rotating member are axially symmetrically arranged, and their symmetry axes serve as the symmetry axes of the rotating components. The extension lines of the symmetry axes of each group of rotating components are compared to the same intersection, and the intersection is located on the rotation axis of the first synchronizer.

[0075] Each set of rotating components forms a small rotating unit, and the rotating belt 326 of each set of rotating components can rotate cyclically around four rotating parts. Since the extension line of the axis of symmetry of the rotating components is located on the rotation axis of the first synchronizer, when the rotating belt 326 moves with the first shift fork 32 to the position in contact with the synchronizer, the rotation direction of the rotating belt 326 of each rotating component is almost the same as the rotation direction of the corresponding position on the synchronizer, and the sliding friction between the rotating belt 326 of each rotating component and the synchronizer is very small. The above-mentioned method has a simple structure, and each rotating component can be arranged in parallel, which is convenient for installation, and both surface contact and reduced sliding friction are achieved.

[0076] The four-speed gear shifting device of the transmission of this embodiment can utilize the motor 6 to drive the shift drum 1 to rotate. When the shift area 111 of the shift drum 1 rotates to a position connected to the first drive mechanism 3, the shift area 111 can rotate with the shift drum 1 and push the first synchronizer through the first drive mechanism 3 to perform gear shifting operations of two of the gears; when the shift area 111 of the shift drum 1 rotates to a position connected to the second drive mechanism 5, the shift area 111 can rotate with the shift drum 1 and push the second synchronizer 4 through the second drive mechanism 5 to perform gear shifting operations of the other two gears; since the areas where the first drive mechanism 3 and the second drive mechanism 5 are connected to the shift drum 1 are at different angular positions, only one shift drum 1 and two drive mechanisms are needed to respectively perform gear shifting of two gears. The gear shifting operations of the aforementioned four gears can be completed by only one motor 6 driving one shift drum 1 to rotate. Therefore, there are fewer actuators for shifting, the gear shifting action is simple, and the operation is more reliable.

[0077] Example 2

[0078] like Figure 2 and Figure 3 As shown, this embodiment is further improved on the basis of embodiment 1. In this embodiment, the area outside the shift zone 111 in the guide groove 11 is the neutral zone 112. When the first drive mechanism 3 is connected to the neutral zone 112, the first synchronizer is in a neutral state; when the second drive mechanism is connected to the neutral zone 112, the second synchronizer 4 is in a neutral state, and the angle between the first angular position 12 and the second angular position 13 is greater than the center angle corresponding to the shift zone 111.

[0079] In the present invention, the guide groove 11 is composed of a shifting area 111 and a neutral area 112. Since the angle between the first angular position 12 and the second angular position 13 is greater than the central angle of the shifting area 111, the first drive mechanism 3 and the second drive mechanism 5 will not be connected to the shifting area 111 when the shift drum 1 rotates to any angular position. In this way, when one of the synchronizers is in a gear-engaging state, the other synchronizer is in a neutral state, or both synchronizers are in a neutral state, and there will be no situation where both synchronizers are in a gear-engaging state. In this way, conflicts between the various gears can be avoided, thereby further improving the reliability of the gear shift. Using the above method, only one guide groove 11 is needed to achieve the engagement of four gears, so the structure is simpler.

[0080] like Figure 3As shown, in the present embodiment, the shifting zone 111 includes a first guide section 113 and a second guide section 114. When the first drive mechanism 3 is connected to the first guide section 113, the shifting component of the first synchronizer is pushed to the first axial position, and when the first drive mechanism 3 is connected to the second guide section 114, the shifting component of the first synchronizer is pushed to the second axial position; when the second drive mechanism 5 is connected to the first guide section 113, the shifting component of the second synchronizer 4 is pushed to the third axial position, and when the second drive mechanism 5 is connected to the second guide section 114, the shifting component of the second synchronizer 4 is pushed to the fourth axial position.

[0081] like Figure 3 and Figure 4 As shown, Figure 4 The x-axis represents the position of the guide groove 11 in the axial direction, and the y-axis represents the position in the circumferential direction, wherein the first guide section 113 and the second guide section 114 correspond to the height ( Figure 4 The part indicated by H in the middle) is low ( Figure 4 Since the first synchronizer and the second synchronizer 4 are also used for shifting two gears, the two guide sections of the shifting area 111 also correspond to the two gears of each synchronizer. Since the first drive mechanism 3 and the second drive mechanism 5 are located at different angular positions, when the shifting area 111 rotates to the angular position corresponding to the first drive mechanism 3 or the second drive mechanism 5, the corresponding drive mechanism can be shifted. Therefore, in this embodiment, only two high and low gears need to be set in the shifting area 111 of the guide groove 11 to realize the shifting of the four gears of the transmission.

[0082] In this embodiment, in the axial direction of the shift drum 1, the distance between the first guide section 113 and the first axial position is smaller than the distance between the neutral area 112 and the first axial position, and the distance between the neutral area 112 and the first axial position is smaller than the distance between the second guide section 114 and the first axial position.

[0083] In this embodiment, the first guide section 113 and the second guide section 114 are staggered in the axial direction to achieve driving the first drive mechanism 3 or the second drive mechanism 5 to engage in high and low gears. The above method can make the high and low gear engagement positions respectively in the neutral position ( Figure 4 In this way, the distance from the neutral position to any of the high and low gear positions is relatively close, making gear shifting faster and more reliable.

[0084] As a preferred embodiment, in this embodiment, the shift area 111 also includes a third guide section 115. When the first drive mechanism 3 is connected to the third guide section 115, the gear engaging component of the first synchronizer is pushed to the neutral position; when the second drive mechanism 5 is connected to the third guide section 115, the gear engaging component of the second synchronizer 4 is pushed to the neutral position; in the axial direction of the shift drum 1, the distance between the third guide section 115 and the first axial position is equal to the distance between the neutral area 112 and the first axial position, and in the circumferential direction of the shift drum 1, the first guide section 113, the third guide section 115 and the second guide section 114 are arranged in sequence.

[0085] The axial position of the third guide section 115 of the shifting area 111 is the same as the axial position of the neutral area 112. When the first drive mechanism 3 or the second drive mechanism 5 is connected to the guide groove 11 in the third guide section 115, the first synchronizer or the second synchronizer 4 is in a neutral state. The above-mentioned method can make the shift drum 1 rotate to the shifting area 111 and also be in neutral, without waiting until the first drive mechanism 3 or the second drive mechanism 5 is completely out of the shifting area 111, so that the neutral process is simple and quick. In addition, the aforementioned method is adopted to make the two sides adjacent to the high gear area (the first guide section 113) on the guide groove 11 both be areas corresponding to the neutral gear position (neutral area 112 and the third guide section 115), so that no matter which direction the shift drum 1 rotates, the synchronizer will first withdraw to the neutral position. Similarly, the two sides adjacent to the low gear area (the second guide section 114) on the guide groove 11 are both areas corresponding to the neutral gear position (neutral area 112 and the third guide section 115), so that no matter which direction the shift drum 1 rotates, the synchronizer will first withdraw to the neutral position, thereby effectively avoiding conflicts between high and low gears.

[0086] The specific process of shifting gears is as follows:

[0087] The first drive mechanism 3 shifts gears: the motor 6 rotates clockwise ( Figure 1 Looking from the motor 6 to the shift drum 1, the power is transmitted to the shift drum 1 through the rotating shaft 7, the shift drum 1 rotates clockwise to drive the first shift fork 32 to move upward, and the first synchronizer shifts upward; the motor 6 rotates counterclockwise, the power is transmitted to the shift drum 1 through the rotating shaft 7, the shift drum 1 rotates counterclockwise to drive the first shift fork 32 to move downward, and the first synchronizer shifts downward;

[0088] The second drive mechanism 5 shifts: the shift drum 1 rotates counterclockwise by an angle. Figure 1When the shift area 111 in the gear shifting zone rotates to the position where the second sliding member 51 is connected to the guide groove 11 of the shift drum 1, the motor 6 continues to rotate counterclockwise, and the power is transmitted to the shift drum 1 through the rotating shaft 7. The shift drum 1 rotates counterclockwise to drive the second shift fork 52 to move upward, and the second synchronizer 4 shifts gear upward; the motor 6 continues to rotate counterclockwise, and the power is transmitted to the shift drum 1 through the rotating shaft 7. The shift drum 1 rotates counterclockwise to drive the second shift fork 52 to move downward, and the second synchronizer 4 shifts gear downward.

[0089] Example 3

[0090] like Fig.11 As shown, this embodiment provides a transmission, which includes the four-speed transmission shifting device described in the aforementioned embodiment. The transmission can realize a motor 6 driving a shift drum 1 to shift into four different gears. The operation is simple and the cost is low, and the low reliability caused by too many shift actuators is avoided.

[0091] The transmission of this embodiment includes two parts: an input shaft assembly 80 and an output shaft assembly 90; the power generated by the power device of the vehicle is transmitted to the input shaft assembly 80, and the power is transmitted from the input shaft assembly 80 to the output shaft assembly 90 through the coordinated use of the input shaft assembly 80 and the output shaft assembly 90. Finally, the output shaft assembly 90 transmits the power to the transmission shaft. The power device of the aforementioned vehicle includes but is not limited to an engine and an electric motor.

[0092] like Fig.12 As shown, the input shaft assembly 80 includes an input shaft 85, a first gear input gear 81, a second gear input gear, a third gear input gear 83, and a fourth gear input gear, wherein the first gear input gear 81, the third gear input gear, the fourth gear input gear 84, and the second gear input gear are sequentially arranged along the axial direction of the input shaft 85;

[0093] The transmission of this embodiment further includes input shaft 85 bearings, which are arranged at both ends of the input shaft 85 , and are interference fit with the input shaft 85 . The outer diameter of the input shaft 85 cooperates with the housing to support the input shaft assembly 80 .

[0094] The output shaft assembly 90 is provided with an output shaft 95, a first gear output gear 91 meshing with the first gear input gear 81, a second gear output gear meshing with the second gear input gear 82, a third gear output gear meshing with the third gear input gear 83, and a fourth gear output gear meshing with the fourth gear input gear 84;

[0095] The transmission of this embodiment further includes an output shaft 95 bearing, which is arranged at both ends of the output shaft 95 and is interference fit with the output shaft 95 . The outer diameter of the bearing cooperates with the housing to support the output shaft assembly 90 .

[0096] The input shaft 85 can be connected to the output shaft of the engine or motor by means of couplings, splines, etc., so that the power of the engine or motor can be transmitted to the input shaft 85. The output shaft 95 can be connected to the transmission shaft by means of couplings, flanges, splines, etc., so that the power of the output shaft 95 can be transmitted to the transmission shaft.

[0097] In this embodiment, the gearbox can switch four different gears, namely, first gear, second gear, third gear and fourth gear. The gears on the input shaft 85 for realizing the above four gears correspond to the first gear input gear 81, the second gear input gear, the third gear input gear 83 and the fourth gear input gear. The gears on the output shaft 95 for realizing the above four gears correspond to the first gear output gear 91, the second gear output gear 92, the third gear output gear and the fourth gear output gear 94. The gears of the same gear on the input shaft 85 and the output shaft 95 are meshed with each other.

[0098] In this embodiment, the arrangement order of the input gears of the aforementioned four gears along the axial direction of the input shaft 85 is: first gear input gear 81, third gear input gear, fourth gear input gear 84 and second gear input gear. The arrangement order of the output gears of the aforementioned four gears along the axial direction of the output shaft 95 is: first gear output gear 91, third gear output gear 93, fourth gear output gear and second gear output gear 92. The arrangement of the aforementioned gears is not arranged in the order of first gear, second gear, third gear and fourth gear step by step, but adopts the gear arrangement method of alternating gears, wherein the first gear and the second gear are separated by the third gear, the third gear and the fourth gear are separated by the second gear, and the third gear and the fourth gear are arranged in the middle of the shaft system. This embodiment uses a shifting mechanism to switch the gears of the transmission. Since the first gear and the second gear are separated, the first gear and the second gear can be engaged separately without interfering and affecting each other, so that the comfort of engaging the gear is improved. Similarly, the second gear and the third gear can also be shifted separately without interfering with or affecting each other, thus improving the comfort of shifting gears.

[0099] In this embodiment, the shift mechanism includes a first synchronizer 2 and a second synchronizer 4, the first synchronizer 2 is arranged on the input shaft 85, and the second synchronizer 4 is arranged on the output shaft 95, the first synchronizer 2 is used to make the input shaft 85 of the transmission rotate synchronously with the second gear input gear 82 or the fourth gear input gear 84, and the second synchronizer 4 is used to make the output shaft 95 of the transmission rotate synchronously with the first gear output gear 91 or the third gear output gear 93.

[0100] In this embodiment, the first synchronizer 2 and the second synchronizer 4 are arranged on different shaft systems, so that the first synchronizer 2 and the second synchronizer 4 are staggered, so that the two synchronizers will not interfere with each other during gear shifting. Since the first gear and the second gear are staggered, and the second synchronizer 4 is used when the first gear is engaged, and the first synchronizer 2 is used when the second gear is engaged, the first gear and the second gear can be engaged separately without interfering with each other. Since the second gear and the third gear are staggered, and the first synchronizer 2 is used when the second gear is engaged, and the second synchronizer 4 is used when the third gear is engaged, the second gear and the third gear can be engaged separately without interfering with each other. Since the second synchronizer 4 is used when the third gear is engaged, and the first synchronizer 2 is used when the fourth gear is engaged, the third gear and the fourth gear can be engaged separately without interfering with each other. In this embodiment, the above-mentioned gear arrangement and synchronizer arrangement method can make it possible to use different synchronizers for two adjacent gears when engaging the gear step by step, so that the gear engagement process of each gear does not affect each other.

[0101] In this embodiment, the first synchronizer 2 is located between the second gear input gear 82 and the fourth gear input gear, so that the first synchronizer 2 can be combined with the second gear input gear when the gear-engaging component moves toward one side in the axial direction, and can be combined with the fourth gear input gear when the gear-engaging component moves toward the other side in the axial direction, so it is very convenient to engage in the second gear or the fourth gear. The distance that the gear-engaging component needs to move is also relatively short.

[0102] In this embodiment, the second gear input gear is rotationally connected to the input shaft 85, the fourth gear input gear is rotationally connected to the input shaft 85, the first synchronizer 2 is synchronously transmission-connected to the input shaft 85, and when the first synchronizer 2 is in a state of being combined with the second gear input gear, the power of the input shaft 85 is transmitted to the second gear input gear through the first synchronizer 2, and when the first synchronizer 2 is in a state of being combined with the fourth gear input gear, the power of the input shaft 85 is transmitted to the fourth gear input gear through the first synchronizer 2.

[0103] The aforementioned synchronous transmission connection refers to a connection mode that can make the first synchronizer 2 and the input shaft 85 rotate synchronously.

[0104] The second gear input gear is rotatably connected to the input shaft 85, and the fourth gear input gear is rotatably connected to the input shaft 85, which means that the second gear gear can rotate relative to the input shaft 85 after being connected to the input shaft 85, and the fourth gear gear can rotate relative to the input shaft 85 after being connected to the input shaft 85. The second gear input gear and the fourth gear input gear can be loosely mounted on the input shaft 85, so that the second gear input gear and the fourth gear input gear can rotate relative to the input shaft 85.

[0105] The input shaft assembly 80 of this embodiment further includes a second bearing 86 and a fourth bearing 87, wherein the second bearing 86 is disposed on the input shaft 85, and the second gear input gear is rotatably connected to the input shaft 85 via the second bearing 86, and the fourth gear input gear is rotatably connected to the input shaft 85 via the fourth bearing 87. The second bearing 86 and the fourth bearing 87 are preferably needle bearings. Of course, other types of bearings may also be used in other embodiments, which are not limited here.

[0106] The first synchronizer 2 can be synchronously connected with the input shaft 85 through a spline. For example, a spline is provided on the outer diameter of the input shaft 85, and a keyway matched with the spline is provided on the inner wall of the first synchronizer 2. The spline on the input shaft 85 is inserted into the keyway of the first synchronizer 2 along the axial direction, so that the first synchronizer 2 and the input shaft 85 are connected. The first synchronizer 2 can rotate synchronously with the input shaft 85 by virtue of the cooperation between the spline and the keyway.

[0107] Since the first synchronizer 2 rotates synchronously with the input shaft 85, when the first synchronizer 2 is combined with the second gear input gear, the second gear input gear rotates synchronously with the first synchronizer 2 under the drive of the first synchronizer 2. When the first synchronizer 2 is combined with the fourth gear input gear, the fourth gear input gear rotates synchronously with the first synchronizer 2 under the drive of the first synchronizer 2.

[0108] like Fig.11 and Fig.13 As shown, in the present embodiment, the first gear output gear is rotationally connected to the output shaft 95, the third gear output gear 93 is rotationally connected to the output shaft 95, the second synchronizer 4 is synchronously transmission-connected to the output shaft 95, and when the second synchronizer 4 is in a state of being combined with the first gear output gear, the power of the first gear output gear is transmitted to the output shaft 95 through the second synchronizer 4, and when the second synchronizer 4 is in a state of being combined with the third gear output gear 93, the power of the third gear output gear 93 is transmitted to the output shaft 95 through the second synchronizer 4.

[0109] The aforementioned synchronous transmission connection refers to a connection mode that can make the second synchronizer 4 and the output shaft 95 rotate synchronously. The aforementioned first gear output gear is rotationally connected with the output shaft 95, and the third gear output gear 93 is rotationally connected with the output shaft 95. It means that the first gear gear can rotate relative to the output shaft 95 after being connected to the output shaft 95, and the third gear gear can rotate relative to the output shaft 95 after being connected to the output shaft 95. The first gear output gear and the third gear output gear 93 can be loosely sleeved on the output shaft 95, so that the first gear output gear and the third gear output gear 93 can rotate relative to the output shaft 95.

[0110] like Fig.11 and Fig.13 As shown, the output shaft assembly 90 of this embodiment further includes a first bearing 96 and a third bearing 97, wherein the first bearing 96 is disposed on the output shaft 95, and the first gear output gear is rotatably connected to the output shaft 95 via the first bearing 96, and the third gear output gear 93 is rotatably connected to the output shaft 95 via the third bearing 97. The first bearing 96 and the third bearing 97 are preferably needle bearings. Of course, other types of bearings may also be used in other embodiments, which are not limited here.

[0111] Through the above design, the third and fourth gears are arranged in the middle when the shaft system is arranged, and the first and second gears are arranged on both sides, which is beneficial to the spatial arrangement of the needle rollers and reduces other parts. The synchronizer used to combine with the second and fourth gears is arranged on the input shaft 85, which can greatly reduce the synchronizer capacity requirements and reduce the synchronizer cost.

[0112] The second synchronizer 4 can be synchronously connected with the output shaft 95 through a spline. For example, a spline is provided on the outer diameter of the output shaft 95, and a keyway matched with the spline is provided on the inner wall of the first synchronizer 2, and the spline on the output shaft 95 is inserted into the keyway of the first synchronizer 2 along the axial direction, so that the second synchronizer 4 and the output shaft 95 are connected, and the second synchronizer 4 can rotate synchronously with the output shaft 95 by virtue of the cooperation between the spline and the keyway.

[0113] Since the second synchronizer 4 rotates synchronously with the input shaft 85, when the second synchronizer 4 is coupled with the third gear output gear 93, the third gear output gear 93 rotates synchronously with the second synchronizer 4 under the drive of the second synchronizer 4. When the second synchronizer 4 is coupled with the fourth gear input gear, the fourth gear input gear rotates synchronously with the second synchronizer 4 under the drive of the second synchronizer 4.

[0114] like Fig.13 As shown, in the present embodiment, the second synchronizer 4 is located between the first gear output gear 91 and the third gear output gear 93, so that the second synchronizer 4 used for engaging the gear component can be combined with the first gear output gear 91 when it moves toward one side in the axial direction, and can be combined with the third gear output gear 93 when it moves toward the other side in the axial direction. Therefore, it is very convenient to engage the first gear or the third gear, and the distance that the gear engaging component needs to move is relatively short.

[0115] The first gear input gear and the third gear input gear can be connected to the input shaft 85 via splines and rotate synchronously with the input shaft 85, while the second gear output gear 92 and the fourth gear output gear 94 can be connected to the output shaft 95 via splines and rotate synchronously with the output shaft 95.

[0116] The method for performing gear shift control using the transmission of this embodiment is as follows:

[0117] The first synchronizer 2 is controlled to be in a state of being separated from both the fourth gear input gear and the second gear input gear, while the second synchronizer 4 is in a state of being combined with the first gear output gear and separated from the third gear output gear 93, and the gear position of the transmission is switched to the first gear;

[0118] The first synchronizer 2 is controlled to be in a state of being engaged with the second gear input gear and separated from the fourth gear input gear, while the second synchronizer 4 is in a state of being separated from both the first gear output gear and the third gear output gear 93, and the gear position of the transmission is switched to the second gear;

[0119] The first synchronizer 2 is controlled to be in a state of being separated from both the fourth gear input gear and the second gear input gear, and the second synchronizer 4 is in a state of being combined with the third gear output gear 93 and separated from the first gear output gear, and the gear position of the transmission is switched to the third gear;

[0120] The first synchronizer 2 is controlled to be in a state of being engaged with the fourth gear input gear and separated from the second gear input gear, while the second synchronizer 4 is in a state of being separated from both the first gear output gear and the third gear output gear 93, and the gear position of the transmission is switched to the fourth gear.

[0121] The specific operation process is as follows:

[0122] When the first gear is engaged, the second synchronizer 4 is engaged to the left, the first gear output gear is connected to the output shaft 95, the power is transmitted to the input shaft 85 through the spline, and the input shaft 85 is transmitted to the first gear output gear on the output shaft 95 through the first gear input gear on the input shaft 85. The first gear output gear transmits the power to the output shaft 95, and transmits the power to the transmission shaft through the spline on the output shaft 95;.

[0123] When the second gear is engaged, the first synchronizer 2 is engaged to the right, the second gear input gear is connected to the input shaft 85, the power is transmitted to the input shaft 85 through the spline, the input shaft 85 is transmitted to the second gear input gear through the spline connection, the second gear input gear transmits the power to the second gear output gear 92, the second gear output gear 92 transmits the power to the output shaft 95 through the spline, and the second gear output shaft 95 transmits the power to the transmission shaft through the spline;.

[0124] When the third gear is engaged, the second synchronizer 4 is shifted to the right, the third gear output gear 93 is connected to the output shaft 95, the power is transmitted to the input shaft 85 through the spline, the input shaft 85 is transmitted to the third gear output gear 93 through the third gear input gear, the third gear output gear 93 is transmitted to the output shaft 95, and the power is transmitted to the transmission shaft through the spline on the output shaft 95.

[0125] When shifting to the fourth gear, the first synchronizer 2 is shifted to the left, the fourth input gear is connected to the input shaft 85, the power is transmitted to the input shaft 85 through the spline, the input shaft 85 is transmitted to the fourth input gear through the spline connection, the fourth input gear is transmitted to the fourth output gear on the output shaft 95, and the output shaft 95 is transmitted to the transmission shaft through the spline.

[0126] Example 4

[0127] like Fig.14 As shown, this embodiment provides a transmission flange, which mainly includes a flange body 410, a first transmission structure 420, a first connection structure 430 and a second transmission structure 440:

[0128] The first transmission structure 420 is disposed on the flange body 410, and the first transmission structure 420 is used to connect with the transmission output shaft and transmit the torque of the transmission output shaft to the flange body 410;

[0129] like Fig.15 and Fig.17 As shown, the output shaft of the transmission is connected to the flange body 410 through the first transmission structure 420. When the output shaft of the transmission rotates, the torque of the output shaft of the transmission acts on the first transmission structure 420, and drives the flange body 410 to rotate together through the first transmission structure 420, so that the rotation and torque of the output shaft are transmitted to the flange body 410.

[0130] The first connection structure 430 is disposed on the flange body 410, and the first connection structure 430 is used to connect the flange body 410 with the transmission shaft;

[0131] In this embodiment, the first connection structure 430 only plays a connecting role. The first connection structure 430 prevents the transmission shaft and the flange body 410 from being loosened by connecting the flange body 410 to the transmission shaft.

[0132] The second transmission structure 440 is disposed at one end of the flange body 410 facing the transmission shaft, and the second transmission structure 440 is used to transmit the torque of the flange body 410 to the transmission shaft and prevent the torque from being transmitted to the first connection structure 430 .

[0133] When the flange body 410 rotates under the drive of the gearbox output shaft, the torque of the flange body 410 is transmitted to the transmission shaft through the second transmission structure 440. In the process of the flange body 410 driving the transmission shaft to rotate, the second transmission structure 440 is responsible for bearing the torque of the transmission. In addition, the second transmission structure 440 is also used to prevent the torque from being transmitted to the first connection structure 430, so that in the process of the flange transmitting the torque to the transmission shaft, the first connection structure 430 will not be affected by the torque, so it is not easy to be damaged, and the first connection structure 430 can always be guaranteed to connect the flange body 410 and the transmission shaft, thereby improving the safety of the flange connection, and the number of the first connection structure 430 can be appropriately reduced to simplify the structure and reduce costs.

[0134] As a preferred implementation, in this embodiment, the second transmission structure 440 is a rectangular tooth, which is arranged on the end face where the flange body 410 is connected to the transmission shaft, and the rectangular teeth on the flange body 410 are used to cooperate with the rectangular teeth on the transmission shaft to transmit torque.

[0135] The rectangular teeth are in the shape of long strips, and the cross section of the rectangular teeth is rectangular. In this embodiment, rectangular teeth that match the rectangular teeth on the flange body 410 can be provided on the transmission shaft. After the flange body 410 is installed and connected with the transmission shaft, the end face of the flange body 410 matches the transmission shaft, and the rectangular teeth on the flange body 410 are embedded with the rectangular teeth on the transmission shaft. When the flange body 410 rotates, the rectangular teeth on the flange body 410 contact the rectangular teeth on the adjacent transmission shaft, and the rectangular teeth on the flange body 410 push the rectangular teeth on the adjacent transmission shaft, so that the transmission shaft rotates with the flange body 410. The rectangular teeth can be directly processed on the end face of the flange body 410 by milling. In order to make the flange structure simpler while realizing that the rectangular teeth bear torque, the rectangular teeth are formed by two adjacent tooth grooves, and the tooth grooves are formed by the end face of the flange body 410 being recessed in the direction away from the transmission shaft. The use of the above structure to form the rectangular teeth can make the top of the rectangular teeth flush with the end surface of the flange body 410, so it does not take up extra space, and only needs to directly remove material from the original flange body 410 to form the tooth groove. The rectangular teeth formed in this way are an integrated structure with the flange body 410, which has little impact on the original flange body 410. The overall structure is simple and has a strong bearing capacity.

[0136] In this embodiment, the first connecting structure 430 is connected to the transmission shaft through a first connecting member; in the rotation direction of the flange, the fitting clearance between the first connecting member and the first connecting structure 430 is greater than the fitting clearance between the rectangular teeth on the flange body 410 and the rectangular teeth on the transmission shaft.

[0137] Since the matching clearance between the first connecting member and the first connecting structure 430 is larger than the matching clearance between the rectangular teeth on the flange body 410 and the rectangular teeth on the transmission shaft in the rotation direction of the flange, when the flange is driven, before the first connecting member contacts and receives force from the first connecting structure 430, the rectangular teeth on the flange body 410 first contact with the rectangular teeth on the transmission shaft. Due to the obstruction of the rectangular teeth on the transmission shaft, the first connecting member and the first connecting structure 430 always have a matching clearance, which can effectively avoid the torque effect between the first connecting structure 430 and the first connecting member during transmission. The aforementioned first connecting member can be a bolt, and the first connecting structure 430 can be a bolt hole. When the flange body 410 is connected to the transmission shaft, the bolt passes through the bolt hole.

[0138] In this embodiment, a plurality of transmission structure groups are arranged on the flange body 410, each transmission structure group includes a plurality of first transmission structures 420 arranged in parallel with each other, the number of the first connection structures 430 is the same as the number of the transmission structure groups, and the first connection structures 430 correspond one-to-one to the transmission structure groups, and the transmission structure groups are used to prevent torque from being transmitted to the first connection structures 430 corresponding thereto.

[0139] like Fig.18 As shown, in this embodiment, a plurality of first connection structures 430 can be arranged along the circumferential direction of the flange body 410 to improve the reliability of the connection. In addition, in this embodiment, a one-to-one corresponding arrangement of the transmission structure group and the first connection structure 430 is adopted. Each first connection structure 430 is protected by a corresponding transmission structure group, and it is ensured that in the corresponding first connection structure 430 and the transmission structure group, the transmission structure group is preferably better than the first connection structure 430 in bearing torque, thereby avoiding the problem that when multiple first connection structures 430 are arranged, it is impossible to ensure that all first connection structures 430 will not be subjected to torque. Each group of transmission structure groups can be provided with a plurality of first transmission structures 420 arranged in parallel with each other. During transmission, each first transmission structure 420 in the same group can bear torque together. In this way, the torque acting on the flange is dispersed to each transmission structure group and then further dispersed to each first transmission structure 420, so that the torque borne by each first transmission mechanism becomes smaller, while the torque that can be borne by the whole becomes larger.

[0140] In addition, in the rotation direction, the first connection structure 430 is located at the center of the transmission structure group to which it corresponds. The above-mentioned method can make each first transmission structure 420 in the transmission structure group be subjected to torque before the first connection structure 430 contacts the first connection member, regardless of whether the flange body 410 rotates forward or reversely, thereby ensuring that the torque is not transmitted to the first connection structure 430.

[0141] For example, six transmission structure groups can be arranged on the flange body 410, and each transmission structure group is provided with four rectangular teeth. The four rectangular teeth are parallel to each other and are symmetrically arranged with the diameter of the flange body 410 parallel to the four rectangular teeth as the symmetry axis. The first transmission structure 420 corresponding to the group of rectangular teeth is arranged on the symmetry axis of the group. The six transmission structure groups are evenly distributed along the circumferential direction of the flange body 410, that is, the angle of interval between any two adjacent transmission structure groups in the six transmission structure groups is the same, and the interval between the two adjacent groups is 60 degrees. It can be understood that the number of the aforementioned transmission groups and the number of the first connecting structures 430 in each transmission structure group can also adopt other numbers, which are not limited here.

[0142] In this embodiment, a plurality of parallel rectangular teeth can be used in a transmission structure group, and the length of each rectangular tooth is the same as the radial dimension of the end face of the flange body 410. The above method can further increase the torque bearing capacity of each transmission structure group without increasing the number of rectangular teeth in each group.

[0143] like Fig.17 As shown, in this embodiment, the flange body 410 includes a cylindrical first connecting portion 411 and a disc-shaped second connecting portion 412, the first connecting portion 411 and the second connecting portion 412 are arranged along the axial direction of the flange body 410, the first connecting portion 411 is provided with a through hole penetrating the connecting portion, the first transmission structure 420 is a spline, and the spline is arranged on the through hole of the first connecting portion 411, and the first connecting structure 430 is arranged on the second connecting portion 412.

[0144] When the first connection structure 430 adopts rectangular teeth, the rectangular teeth are arranged on the disc surface of the second connection portion 412 facing the transmission shaft.

[0145] In this embodiment, the first connection portion 411 is used to realize the connection between the flange body 410 and the transmission output shaft, and the second connection portion 412 is used to realize the connection between the flange body 410 and the transmission shaft. In this embodiment, the first connection portion 411 and the second connection portion 412 are arranged along the axial direction of the flange body 410, so that the transmission output shaft and the transmission shaft are compactly distributed on both sides of the axial direction of the flange, so that the mutual influence between the power input side and the power output side can be avoided.

[0146] In this embodiment, a spline is used for transmission at the power input side, and the transmission has a strong load-bearing capacity. A through hole can be processed in the first connecting portion 411 first, and then a spline can be processed on the inner wall of the through hole.

[0147] In this embodiment, the second transmission structure 440 extends from the inner wall of the through hole to the outer wall of the second connecting portion 412 along the radial direction of the second connecting portion 412. This method can fully utilize the radial size of the disk of the second connecting portion 412 to maximize the length of the rectangular teeth that can withstand torque.

[0148] When the rectangular tooth is longer, the deformation of the rectangular tooth under the action of torque will increase. When the deformation exceeds a certain level, the same rectangular tooth will not be in sufficient contact with its matching rectangular tooth, which will reduce the load-bearing capacity of the rectangular tooth. In this regard, in the present embodiment, each rectangular tooth is composed of a plurality of sub-rectangular teeth of smaller lengths, and two adjacent sub-rectangular teeth are disconnected. After adopting the above-mentioned method, the deformation of each sub-rectangular tooth will not be accumulated on other sub-rectangular teeth, so that the deformation of the rectangular tooth can be dispersed to each sub-rectangular tooth, and the deformation of each sub-rectangular tooth is very small and will not exceed the level that can cause insufficient contact of the rectangular teeth. The gap between adjacent sub-rectangular teeth can be very small, so the above-mentioned structure will not significantly reduce the length of the part of the rectangular tooth that can withstand torque.

[0149] like Fig. 20 As shown, in this embodiment, each transmission structure group is composed of two sub-transmission structure groups, namely the first sub-transmission structure group 441 and the second sub-transmission structure group 442. The number, cross-sectional shape, and arrangement interval of the rectangular teeth in the two sub-transmission structure groups are equal, but the two sub-transmission structure groups are staggered in the circumferential direction, and each rectangular tooth is also divided into two disconnected parts, and belongs to the two sub-transmission structure groups. The above-mentioned method can reduce the deformation of the rectangular teeth without reducing the total length of the rectangular teeth used to bear the torque. After the two sub-transmission structure groups are staggered in the circumferential direction, the force on the flange body 410 will not be concentrated on the same circumferential position of the flange body 410, and the deformation of the flange body 410 will also be dispersed to various positions of the flange body 410 in the circumferential direction.

[0150] One end of each rectangular tooth in the first sub-transmission structure group 441 extends to the outer wall of the flange body 410, so that the milling cutter can remove material from the outer side of the flange body 410 to the inner side at one time to complete the processing of the rectangular teeth, which can significantly improve the processing efficiency.

[0151] The first sub-transmission structure group 441 and the second sub-transmission structure group 442 may be completely staggered or partially staggered in the circumferential direction. When the completely staggered method is adopted, the first sub-transmission structure group 441 and the second sub-transmission structure group 442 partially overlap in the radial direction. The portion where the first sub-transmission structure group 441 and the second sub-transmission structure group 442 are disconnected on the flange body 410 cannot withstand torque, and the force on the portion of the first sub-transmission structure group 441 and the second sub-transmission structure group 442 near the disconnected position will also change abruptly, which will affect the service life of the flange. After the first sub-transmission structure group 441 and the second sub-transmission structure group 442 partially overlap in the radial direction, the portion of the original flange body 410 that cannot withstand torque due to the disconnection of the radial teeth in the radial direction is eliminated, and the force on the portion of the first sub-transmission structure group 441 and the second sub-transmission structure group 442 near the disconnected position is avoided.

[0152] When the incomplete staggered method is adopted, the tooth grooves of the rectangular teeth in the first sub-transmission structure group 441 and the tooth tops of the rectangular teeth in the second sub-transmission structure group 442 can be aligned. The above method can make the portion of the flange body 410 used for bearing torque in the circumferential direction of the same transmission structure group the largest, so that the flange body 410 can withstand more torque.

[0153] like Fig.19 As shown, in this embodiment, the same transmission structure group is composed of three sub-transmission structure groups, which are respectively the third sub-transmission structure group 443, the fourth sub-transmission structure group 444 and the fifth sub-transmission structure group 445 from the outer wall of the flange body 410 to the inside. The rectangular teeth of each transmission structure group are disconnected from each other, and the length of the rectangular teeth of the third sub-transmission structure group 443 is less than that of the fourth sub-transmission structure group 444, and the length of the rectangular teeth of the fourth sub-transmission structure group 444 is less than that of the fifth sub-transmission structure group 445. Under the condition of bearing the same torque, the outer side of the flange body 410 is deformed more than the inner side thereof. This embodiment adopts the aforementioned structure in which the length of the rectangular teeth becomes shorter from the inside to the outside, so that the variance of the deformation of the rectangular teeth at each radial position of the flange body 410 can be reduced, so as to avoid excessive deformation of the rectangular teeth at a local position in the radial direction of the flange body 410, which affects the service life of the flange.

[0154] like Fig.16 As shown, in this embodiment, a limiting hole 4121 cooperating with the transmission shaft is provided on the second connection part 412, and a stop 4122 for limiting the axial position of the transmission shaft is provided at one end of the limiting hole 4121 facing the first connection part 411, and the spline extends to the position of the stop 4122.

[0155] During installation, the end of the transmission shaft can be inserted into the limiting hole 4121 of the second connecting portion 412 until the end of the transmission shaft abuts against the stop 4122. The output shaft of the gearbox can be inserted into the through hole. Since the spline in the through hole extends to the stop 4122, the distance between the position where the input end transmits torque and the end of the transmission shaft is shorter. The above method can shorten the distance between the position where the input end transmits torque and the position where the output end transmits torque, thereby reducing the deformation of the transmission component between the input end and the output end under the action of torque.

[0156] Example 5

[0157] This embodiment provides a vehicle, which includes the transmission and / or transmission flange described in the above embodiments. The vehicle of this embodiment can be a traditional fuel vehicle such as a gasoline vehicle, a diesel vehicle, etc., or a new energy vehicle. The new energy vehicle includes but is not limited to pure electric (BEV / EV), hybrid (HEV, PHEV and REEV), fuel cell vehicle (FCEV), and solar cell vehicle.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission based on synchronizer shifting, characterized in that: include: A four-speed shift device, the four-speed shift device includes a shift drum, a first synchronizer, a second synchronizer, a first drive mechanism, a second drive mechanism, a rotating shaft and a motor, the shift drum is cylindrical, a guide groove extending along its circumferential direction is provided on the cylindrical peripheral wall of the shift drum, the guide groove includes a shift area that rotates to different angular positions with the shift drum, the first drive mechanism and the second drive mechanism are arranged on both sides of the shift drum axis direction and are slidably connected to the shift drum, the first synchronizer and the second synchronizer are arranged on both sides of the shift drum axis direction, and the first synchronizer and the second synchronizer are both provided with a gear engaging component , the gear engaging component is a synchronizing ring of a first synchronizer or a second synchronizer, the first driving mechanism and the second driving mechanism are respectively used to drive the first synchronizer and the second synchronizer to perform a gear shifting operation, the motor is used to drive the shift drum to rotate so that the shift area drives the first driving mechanism and the second driving mechanism to move back and forth along the axial direction of the shift drum, the rotating shaft and the shift drum are interference fit, the motor is synchronously connected to the rotating shaft, the motor drives the rotating shaft to rotate, and the rotating shaft drives the shift drum to rotate so that the shift area drives the first driving mechanism and the second driving mechanism to move back and forth along the axial direction of the shift drum; An input shaft assembly, the input shaft assembly comprising an input shaft, a first gear input gear, a second gear input gear, a third gear input gear and a fourth gear input gear, the first synchronizer is connected to the input shaft for synchronous rotation, the first gear input gear, the third gear input gear, the fourth gear input gear and the second gear input gear are arranged in sequence along the axial direction of the input shaft; An output shaft assembly, the output shaft assembly includes an output shaft, a first gear output gear, a second gear output gear, a third gear output gear and a fourth gear output gear, the second synchronizer is connected to the output shaft for synchronous rotation, and the first gear output gear, the third gear output gear, the fourth gear output gear and the second gear output gear are arranged in sequence along the axial direction of the output shaft.

2. The synchronizer-shifted transmission according to claim 1, characterized in that: The first driving mechanism includes a first sliding member, a first shift fork and a first connecting member, the first connecting member is respectively connected to the first sliding member and the first shift fork, and the first sliding member slides along the guide groove; the second driving mechanism includes a second sliding member, a second shift fork and a second connecting member, the second connecting member is respectively connected to the second sliding member and the second shift fork, and the second sliding member slides along the guide groove; an annular limiting groove is provided on the peripheral wall of the first synchronizer and the second synchronizer.

3. The synchronizer-shifted transmission according to claim 1, characterized in that: The guide groove on the shift drum is provided with a first angular position and a second angular position along the circumferential direction, the first drive mechanism is connected to the first angular position of the guide groove via a first sliding member, and the second drive mechanism is connected to the second angular position of the guide groove via a second sliding member, and the first angular position is different from the second angular position.

4. The synchronizer-shifted transmission according to claim 3, characterized in that: The area outside the shift zone in the guide groove is the neutral zone. When the first drive mechanism and the second drive mechanism are connected to the neutral zone, the first synchronizer and the second synchronizer are in a neutral state; the first drive mechanism, driven by the shift zone, pushes the gear engaging component of the first synchronizer to move along the axial direction of the first synchronizer to the first axial position to engage in gear, or pushes the gear engaging component of the first synchronizer to move along the axial direction of the first synchronizer to the second axial position to engage in gear, wherein the first axial position is different from the second axial position; the second drive mechanism is used to push the gear engaging component of the second synchronizer to move along the axial direction of the second synchronizer to the third axial position to engage in gear, or pushes the gear engaging component of the second synchronizer to move along the axial direction of the second synchronizer to the fourth axial position to engage in gear, wherein the third axial position is different from the fourth axial position.

5. The synchronizer-shifted transmission according to claim 4, characterized in that: The shifting area includes a first guide section, a second guide section and a third guide section. When the first driving mechanism is connected to the first guide section, the shifting component of the first synchronizer is pushed to the first axial position, and when the first driving mechanism is connected to the second guide section, the shifting component of the first synchronizer is pushed to the second axial position; when the second driving mechanism is connected to the first guide section, the shifting component of the second synchronizer is pushed to the third axial position, and when the second driving mechanism is connected to the second guide section, the shifting component of the second synchronizer is pushed to the fourth axial position; the third guide section is axially placed on the shift drum at the same height as the neutral area, and the first guide section, the third guide section and the second guide section are arranged in sequence.

6. The synchronizer-shifted transmission according to claim 1, characterized in that: The first gear input gear is meshed with the first gear output gear, the second gear input gear is meshed with the second gear output gear, the third gear input gear is meshed with the third gear output gear, and the fourth gear input gear is meshed with the fourth gear output gear; The first synchronizer is located between the second gear input gear and the fourth gear input gear, and the second synchronizer is located between the first gear output gear and the third gear output gear.

7. The synchronizer-shifted transmission according to claim 6, characterized in that: When the gear engaging component on the first synchronizer moves toward one side in the axial direction, it engages with the second gear gear, and when it moves toward the other side in the axial direction, it engages with the fourth gear input gear; the second gear input gear is rotationally connected to the input shaft, and the fourth gear input gear is rotationally connected to the input shaft. When the first synchronizer is engaged with the second gear input gear, the power of the input shaft is transmitted to the second gear input gear through the first synchronizer, and when the first synchronizer is engaged with the fourth gear input gear, the power of the input shaft is transmitted to the fourth gear input gear through the first synchronizer; the first gear input gear and the third gear input gear are synchronously connected and rotated with the input shaft through splines.

8. The synchronizer-shifted transmission according to claim 6, characterized in that: When the gear engaging component on the second synchronizer moves toward one side in the axial direction, it engages with the first gear output gear, and when it moves toward the other side in the axial direction, it engages with the third gear output gear; the first gear output gear is rotationally connected to the output shaft, and the third gear output gear is rotationally connected to the output shaft. When the second synchronizer is engaged with the first gear output gear, the power of the first gear output gear is transmitted to the output shaft through the second synchronizer, and when the second synchronizer is engaged with the third gear output gear, the power of the third gear output gear is transmitted to the output shaft through the second synchronizer; the second gear output gear and the fourth gear output gear are connected to the output shaft through splines, and rotate synchronously with the output shaft.

9. The synchronizer-shifted transmission according to claim 1, characterized in that: The input shaft assembly also includes a second bearing and a fourth bearing, the second bearing is arranged on the input shaft, the second gear input gear is rotatably connected to the input shaft through the second bearing, the fourth bearing is arranged on the input shaft, and the fourth gear input gear is rotatably connected to the input shaft through the fourth bearing; the output shaft assembly also includes a first bearing and a third bearing, the first bearing is arranged on the output shaft, the first gear output gear is rotatably connected to the output shaft through the first bearing, the third bearing is arranged on the output shaft, and the third gear output gear is rotatably connected to the output shaft through the third bearing.

10. A vehicle, characterized in that A transmission based on synchronizer shifting comprising any one of claims 1 to 9.

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