Transmission gear shifting actuator and transmission

Abstract

The invention relates to a transmission gear shifting actuator and a transmission. The transmission shift actuator comprises: a base; the driver is fixedly connected with the base; the main shaft is arranged at the output end of the driver, and the driving block is in transmission connection with the main shaft; the middle of the shifting fork is hinged to the base, one end of the shifting fork is in transmission connection with the driving block, and the other end of the shifting fork is in transmission connection with a synchronous device of a transmission; the driver drives the driving block to do linear motion through the main shaft, and then the shifting fork is driven to swing to push the synchronous device to move. The driving block does linear motion to drive the shifting fork to swing, the power of the driver is transmitted to the tail end of the shifting fork through the lever structure with the hinge point as the fulcrum, the reliability of the action of the shifting fork is improved, and the service life of the gear shifting actuator is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a transmission shift actuator and a transmission. Background Art

[0002] With the development of transmission technology, automatic drive shifting technology has emerged to meet users' higher requirements. Compared with manual drive shifting technology, this shifting technology is easier for drivers to operate.

[0003] The existing automatic drive shift actuator usually drives the fork shaft by driving force, thereby driving the shift fork to move horizontally to achieve shifting, and the change of the shift fork position drives the synchronizer to move, thereby changing the gear position of the transmission.

[0004] However, under the condition of frequent gear shifting, the fork shaft is susceptible to wear and frequent local force, which reduces the reliability of the fork shaft and further reduces the service life of the gear shift actuator. Summary of the invention

[0005] Based on this, it is necessary to provide a transmission shift actuator and a transmission that can maintain a longer service life under frequent gear shifting conditions in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a transmission shift actuator, the transmission shift actuator comprising:

[0007] Pedestal;

[0008] A driver, the driver is fixedly connected to the base;

[0009] a main shaft, the main shaft being arranged at the output end of the driver,

[0010] A driving block, the driving block is drivingly connected to the main shaft;

[0011] A shift fork, wherein the middle portion of the shift fork is hinged to the base, one end of the shift fork is transmission-connected to the drive block, and the other end of the shift fork is transmission-connected to a synchronization device of the transmission;

[0012] The driver drives the driving block to perform linear motion via the main shaft, thereby driving the shift fork to swing and push the synchronization device to move.

[0013] In one embodiment, the structure of the driving block includes a connecting member, which is transmission-connected to the main shaft, and a guide rail is provided on the connecting member. The guide rail is slidably matched with the upper end of the fork, and the sliding direction of the upper end of the fork in the guide rail is perpendicular to the axis of the main shaft and parallel to the swing surface of the fork.

[0014] In one embodiment, the structure of the shift fork includes an intermediate rod and two extension rods, the two extension rods are respectively located at both ends of the intermediate rod and form a door-shaped structure with the intermediate rod, the intermediate rod is provided with a contact, the contact slides with the guide rail, and each extension rod is hinged to the base.

[0015] In one embodiment, the main shaft is a screw, the connecting member is threadedly connected to the main shaft, and the driver is used to drive the main shaft to rotate;

[0016] The base is provided with a guide structure, which is slidably matched with the driving block and performs circumferential positioning of the driving block.

[0017] In one of the embodiments, a pair of wing plates are provided on the connecting member, a guide rail is formed between the two wing plates, the wing plates are slidably matched with the guide structure, and the driving block is circumferentially limited.

[0018] In one embodiment, the driver is a motor, and the output end of the motor is drivingly connected to the main shaft.

[0019] In one of the embodiments, the structure of the base includes a lower shell and an upper shell detachably connected to the lower shell, the lower shell is provided with a fork opening for passing the shift fork, two grooves are relatively arranged in the upper shell, and the guide structure includes two grooves, and the two grooves are slidably matched with two sides of the driving block.

[0020] In one of the embodiments, the driver is fixedly installed inside the upper shell.

[0021] In one of the embodiments, a block-shaped fork foot is rotatably mounted on the lower end of the shift fork, and the fork foot contacts a slot on the synchronization device to push the synchronization device to move when the shift fork swings.

[0022] In a second aspect, the present application provides a transmission, comprising the transmission shift actuator as described in any one of the above items.

[0023] The above-mentioned transmission shift actuator and transmission use the driving block to make linear motion to drive the shift fork to swing, and use the hinge point as a fulcrum to transmit the power of the driver to the end of the shift fork through the lever structure, thereby improving the reliability of the shift fork action and increasing the service life of the shift actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of a transmission shift actuator in one embodiment;

[0025] FIG2 is a structural diagram of a transmission shift actuator in one embodiment;

[0026] FIG3 is a three-view diagram of a driving block in one embodiment;

[0027] FIG4 is a three-view diagram of a shift fork in one embodiment;

[0028] FIG5 is a schematic diagram of an upper shell in one embodiment;

[0029] FIG6 is a schematic diagram of a lower shell in one embodiment;

[0030] FIG7 is a schematic diagram of a fork leg in one embodiment;

[0031] FIG. 8 is a schematic diagram of the working process of a transmission shift actuator in one embodiment. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Referring to Figures 1 and 2, Figures 1 and 2 show schematic diagrams of a transmission shift actuator in an embodiment of the present invention. The transmission shift actuator provided in an embodiment of the present invention includes a base, a driver 100, a main shaft 200, a driving block 300 and a shift fork 400.

[0039] The driver 100 is fixedly connected to the base; the main shaft 200 is arranged at the output end of the driver 100; the driving block 300 is connected to the main shaft 200 by transmission; the middle part of the fork 400 is hinged to the base through the positioning pin 500, one end of the fork 400 is connected to the driving block 300 by transmission, and the other end of the fork 400 is connected to the synchronous device of the transmission by transmission; wherein, the driver 100 drives the driving block 300 to make linear motion through the main shaft 200, thereby driving the fork 400 to swing and push the synchronous device to move. The synchronous device is a structure such as a synchronizer or a sleeve inside the transmission.

[0040] By using the driving block 300 to perform linear motion to drive the shift fork 400 to swing, the power of the driver 100 is transmitted to the end of the shift fork 400 through the lever structure with the hinge point as the fulcrum, thereby improving the reliability of the movement of the shift fork 400 and increasing the service life of the shift actuator.

[0041] 2 , 3 and 8 , the structure of the driving block 300 in one embodiment of the present invention includes a connecting member 310, which is transmission-connected to the main shaft 200. A guide rail 320 is provided on the connecting member 310, and the guide rail 320 is slidably matched with the upper end of the fork 400. The sliding direction of the upper end of the fork 400 in the guide rail 320 is perpendicular to the axis of the main shaft 200 and parallel to the swing surface of the fork 400.

[0042] In another embodiment, the driver 100 is an electric cylinder, the output end of the electric cylinder fixes the main shaft 200, and the driving block 300 is fixedly installed on the main shaft 200. The electric cylinder drives the main shaft 200 to move along the axial direction to realize the movement of the driving block 300 along the axial direction of the main shaft 200, wherein the connecting member 310 is fixedly connected to the main shaft 200 to realize transmission with the output end of the electric cylinder.

[0043] 2 and 4 , the guide rail 320 is a guide channel perpendicular to the axis of the main shaft 200 . There are two guide rails 320 , which are parallel to each other and symmetrical about the axis of the main shaft 200 .

[0044] In an exemplary embodiment, as shown in Figures 2 and 4, the structure of the fork 400 includes an intermediate rod 440 and two extension rods 430. The two extension rods 430 are respectively located at both ends of the intermediate rod 440 to form a door-shaped structure with the intermediate rod 440. A contact 420 is provided on the intermediate rod 440. The contact 420 slides with the guide rail 320, and each extension rod 430 is hinged to the base.

[0045] Referring to FIG8 , there are three swinging states of the shift fork 400. In the neutral gear condition, as shown in FIG8 (a), the drive block 300 is in the middle of the main shaft 200, and the shift fork 400 is kept in a vertical state as a whole; in the first gear condition, as shown in FIG8 (b), the driver 100 drives the drive block 300 to make a linear motion through the main shaft 200, and the drive block 300 moves rightward. The guide rail 320 on the drive block 300 pushes the contact 420 of the shift fork 400, so that the shift fork 400 moves in a fixed direction. The shift fork 400 swings around the positioning pin 500, and the lower end of the extension rod 430 moves to the left, completing the first gear shifting. In the second gear condition, as shown in Figure 8 (c), the driver 100 drives the drive block 300 to make a linear motion through the main shaft 200, so that the drive block 300 moves to the left, and the guide rail 320 on the drive block 300 pushes the contact 420 of the shift fork 400, so that the shift fork 400 swings around the positioning pin 500, and the lower end of the extension rod 430 moves to the right, completing the second gear shifting.

[0046] Continuing to refer to FIG. 2 and FIG. 4 , there are two contacts 420, and the two contacts 420 and the extension rod 430 are respectively located on both sides of the middle rod 440, and each extension rod 430 is perpendicular to the middle rod 440. A first pin hole 410 is provided on each extension rod 430, and a positioning pin 500 passes through the first pin hole 410 and a second pin hole 820 on the base to hinge the base with the shift fork 400. In another embodiment, the shift fork 400 is integrally formed, and different from the gate-shaped structure in FIG. 4 , the gate-shaped structure of the shift fork 400 can be an arc-shaped gate-shaped structure.

[0047] As shown in FIG4 , the contact 420 is connected to the intermediate rod 440 through a connecting section, and a cylindrical surface is provided on the contact 420, and the cylindrical surface is in sliding contact with the guide rail 320, so that when the contact 420 slides up and down between the guide rails 320, the fork 400 is driven to swing around the positioning pin 500, thereby realizing the corresponding rotation of the fork 400 with the translation of the driving block 300. The width of the guide rail 320 meets the rotation amplitude requirement of the fork 400, and the contact 420 can be fixed to the intermediate rod 440 by welding.

[0048] In the above embodiments, the base is a component for fixing the driver 100 and hingedly mounting the fork 400, and can be a bracket structure that exposes the main transmission components such as the driver 100, the main shaft 200 and the driving block 300 to the outside.

[0049] In an exemplary embodiment, as shown in FIG. 2 and FIG. 3 , the main shaft 200 is a screw, the connecting member 310 is threadedly connected to the main shaft 200, and the driver 100 is used to drive the main shaft 200 to rotate; a guide structure is provided on the base, the guide structure is slidably matched with the driving block 300, and the driving block 300 is circumferentially limited. The driver 100 is hydraulically driven or electrically driven, driving the main shaft 200 to rotate, and the driving block 300 moves along the linear direction of the axis of the main shaft 200 as the main shaft 200 rotates under the limiting action of the guide structure.

[0050] 3 , the connector 310 is a tubular structure with an internal pipe thread arranged therein to match the external thread of the main shaft 200. The guide rail 320 may be a groove arranged on the tubular structure body and is integrally formed with the connector 310.

[0051] In another embodiment, as shown in FIG3 , a pair of wing plates 330 are provided on the connecting member 310, a guide rail 320 is formed between the two wing plates 330, and the wing plates 330 are slidably matched with the guide structure and circumferentially limit the driving block 300. There are two pairs of wing plates 330 on the connecting member 310, which are respectively provided on both sides of the connecting member 310 and are symmetrical about the axis of the main shaft 200. The wing plates 330 can be integrally formed with the connecting member 310, or can be formed by welding or machining.

[0052] Continuing to refer to FIGS. 2 to 4 , there are two guide rails 320 and two contacts 420 , both of which are located on both sides of the axis of the main shaft 200 , so as to evenly transmit the driving force of the driver 100 to the shift fork 400 .

[0053] In this embodiment, the driver 100 is a motor, and the output end of the motor is in transmission connection with the main shaft 200. The shift actuator of this embodiment is driven by the motor to swing the fork 400, thereby realizing the shift function. The main shaft 200 is connected to the driver 100 and rotates synchronously with the driver 100. The motor can be a servo motor to accurately control the moving position of the driving block 300.

[0054] Referring to FIG8 , the working process of the shift actuator of this embodiment is as follows:

[0055] In the neutral condition, as shown in FIG. 8 ( a ), the driving block 300 is located in the middle of the main shaft 200 , and the shift fork 400 remains vertical as a whole.

[0056] In the first gear condition, as shown in Figure 8 (b), the driver 100 rotates forward, and the main shaft 200 rotates forward with the driver 100. Since the driving block 300 is circumferentially limited by the guide structure, the main shaft 200 drives the connecting member 310 through the threaded transmission, so that the driving block 300 moves rightward and slides in the guide structure. The guide rail 320 on the driving block 300 pushes the contact 420 of the fork 400, so that the fork 400 swings around the positioning pin 500, and the lower end of the extension rod 430 moves to the left, completing the first gear shifting.

[0057] In the second gear condition, as shown in Figure 8 (c), the driver 100 reverses, and the main shaft 200 reverses with the driver 100. Since the driving block 300 is circumferentially limited by the guide structure, the main shaft 200 drives the connecting member 310 through the threaded transmission, so that the driving block 300 translates to the left while sliding in the guide structure. The guide rail 320 on the driving block 300 pushes the contact 420 of the fork 400, so that the fork 400 swings around the positioning pin 500, and the lower end of the extension rod 430 moves to the right, completing the second gear shifting.

[0058] The shift actuator of this embodiment adopts the form of threaded transmission, which reduces the volume of the actuator assembly while ensuring an effective transmission ratio. The function of the shift actuator is realized by using the drive block 300 to drive the shift fork 400 to swing, eliminating the use of the shift fork shaft, thereby reducing the internal space of the transmission.

[0059] In the above embodiments, the guide structure may be two limit baffles arranged on the base, and the spacing between the two limit baffles is adapted to the dimensions of both sides of the driving block 300, so that the driving block 300 can contact the two limit baffles and slide between the two baffles.

[0060] In an exemplary embodiment, as shown in Figures 1, 2, and 4-6, the structure of the base includes a lower shell 800 and an upper shell 700 detachably connected to the lower shell 800, the lower shell 800 is provided with a fork opening 810 for passing the fork 400, and two grooves 710 are relatively arranged in the upper shell 700, and the guide structure includes two grooves 710, and the two grooves 710 are slidably matched with the two sides of the driving block 300.

[0061] Referring to Figure 2, in this embodiment, a space for accommodating the driver 100 is provided on the upper shell 700, and an opening is provided at the bottom; the fork 400 is hinged to the lower shell 800, and the main structure of the lower shell 800 is a sealing plate structure, which is used to close the bottom opening of the upper shell 700. At the same time, a circle of threaded holes is provided on the outer periphery of the sealing plate structure, and a circle of threaded holes is provided on the lower end face of the upper shell 700. The detachable connection between the lower shell 800 and the upper shell 700 is realized by the cooperation of the threaded holes and bolts.

[0062] Referring to FIG. 5 , the upper shell 700 is integrally formed, and two grooves 710 are formed during the shell forming process. The guide structure is easy to process and can also form a receiving cavity together with the upper shell 700 and the lower shell 800 to protect the transmission components, improve the protection performance of the shift actuator, and make the overall structure of the shift actuator compact.

[0063] Referring to FIG. 6 , two forks 810 corresponding to the extension rod 430 are provided on the sealing plate of the lower shell 800, and sleeves 830 are respectively provided at the positions of the two forks 810 so that the inner hole of the sleeve 830 corresponds to the fork 810, and the side wall of the sleeve 830 is provided with a second pin hole 820 corresponding to the positioning pin 500. The extension rod 430 is hinged to the sleeve 830 through the positioning pin 500, and the fork 810 provides a swinging space for the extension rod 430, so that the fork 400 can rotate relative to the lower shell 800 with the positioning pin 500 as the center.

[0064] In addition, the two grooves 710 are respectively located on both sides of the driving block 300. When the wing plates 330 on both sides of the driving block 300 are respectively located in the two grooves 710, the edges of the wing plates 330 slide and cooperate with the grooves 710, and the driving block 300 is circumferentially limited by the contact between the wing plates 330 and the grooves 710. The limited driving block 300 moves in a axial direction of the main shaft 200 under the transmission of the external thread of the main shaft 200, and the forward and backward movement of the driving block 300 is controlled by the forward and reverse rotation of the motor, thereby realizing the swing of the fork 400 in two directions.

[0065] In another embodiment, as shown in FIG. 1 and FIG. 2 , the driver 100 is fixedly installed inside the upper shell 700 . Then the driving block 300 and the spindle 200 are located inside the upper shell 700 together with the driver 100 . When the driver 100 is fixedly installed in place, the driving block 300 is just located between the two grooves 710 .

[0066] The shift actuator of this embodiment is divided into two parts, one is the driving part, and the other is the driven part. The driving part includes an upper shell 700 and a driving block 300 and a main shaft 200 installed in the upper shell 700; the driven part includes a lower shell 800 and a shift fork 400 hingedly installed on the lower shell 800. When the two parts are assembled, just insert the contact 420 of the shift fork 400 into the guide rail 320 on the driving block 300, and then connect the upper shell 700 and the lower shell 800 through fasteners. The structure of the shift actuator of this embodiment is simple and compact, and the assembly and disassembly are simple and convenient. The split base is easy to be formed in one piece, which reduces the processing steps.

[0067] In an exemplary embodiment, as shown in Fig. 1, Fig. 2, and Fig. 7, a block-shaped fork leg 600 is rotatably mounted on the lower end of the shift fork 400, and the fork leg 600 contacts the slot on the synchronization device, and is used to push the synchronization device to move when the shift fork 400 swings. The fork leg 600 is located in the slot on the synchronization device, and the fork leg 600 contacts the slot and can slide relatively. Through the contact with the slot, the force of the lower end of the shift fork 400 is applied to the synchronization device, so that the synchronization device moves, and then the gear shift is realized, avoiding direct friction between the lower end of the shift fork 400 and the slot, and improving the stability of the transmission of the shift fork 400 and the synchronization device.

[0068] 7 , the fork leg 600 is provided with a connecting column 610 , which is rotatably connected to the inner side of the lower end of the extension rod 430 via the connecting column 610 . The cross section of the fork leg 600 can be cylindrical, elliptical or other shapes.

[0069] In another embodiment, as shown in FIG. 7 , the cross-section of the fork leg 600 is an octagon or hexagon with axisymmetric shape, and the upper and lower ends have transition functions to facilitate the insertion of the fork leg 600 into the slot on the synchronization device. The two sides of the axis of symmetry are contact surfaces, so that the contact mode between the rotatable fork leg 600 and the slot is always surface contact, making the transmission process more stable.

[0070] Referring to FIG8 , the working process of the shift actuator of this embodiment is as follows:

[0071] In the neutral condition, as shown in FIG. 8 ( a ), the driving block 300 is located in the middle of the main shaft 200 , the shift fork 400 is kept vertical as a whole, and the fork leg 600 is also in a vertical state.

[0072] In the first gear condition, as shown in Figure 8 (b), the driver 100 rotates forward, and the main shaft 200 rotates forward with the driver 100. Since the driver 100 is fixed to the upper shell 700, and the driving block 300 is limited between the grooves 710 in the upper shell 700, the main shaft 200 drives the connecting member 310 through the threaded transmission, so that the driving block 300 moves horizontally to the right, and the guide rail 320 on the driving block 300 pushes the contact 420 of the fork 400, so that the fork 400 swings around the positioning pin 500 as the center, and the fork leg 600 moves to the left at the same time, completing the first gear shifting. During this process, the fork leg 600 is still in a vertical state.

[0073] In the second gear working condition, as shown in Figure 8 (c), the driver 100 reverses, and the main shaft 200 reverses with the driver 100. Since the driver 100 is fixed to the upper shell 700, and the driving block 300 is limited between the grooves 710 in the upper shell 700, the main shaft 200 drives the connecting member 310 through the threaded transmission, so that the driving block 300 moves horizontally to the left, and the guide rail 320 on the driving block 300 pushes the contact 420 of the fork 400, so that the fork 400 swings around the positioning pin 500 as the center, and the fork leg 600 moves to the right at the same time, completing the second gear shifting. During this process, the fork leg 600 is also in a vertical state.

[0074] In an exemplary embodiment, the present application provides a transmission, which includes a transmission shift actuator as described above. The transmission can effectively improve the reliability of the shift structure, increase the service life of the shift actuator, and facilitate the stable operation of mechanical operations. In addition, a threaded transmission is also adopted, which reduces the volume of the actuator assembly while ensuring an effective transmission ratio. The function of the shift actuator is realized by using a drive block 300 to drive the shift fork 400 to swing, eliminating the use of the shift fork shaft, thereby reducing the internal space of the transmission.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A transmission shift actuator, characterized in that: The transmission shift actuator comprises: Pedestal; A driver, the driver is fixedly connected to the base; A main shaft, the main shaft is arranged at the output end of the driver; A driving block, the driving block is drivingly connected to the main shaft; A shift fork, wherein the middle portion of the shift fork is hinged to the base, one end of the shift fork is transmission-connected to the drive block, and the other end of the shift fork is transmission-connected to a synchronization device of the transmission; The driver drives the driving block to perform linear motion via the main shaft, thereby driving the shift fork to swing and push the synchronization device to move.

2. The transmission shift actuator according to claim 1, characterized in that: The structure of the driving block includes a connecting member, which is transmission-connected to the main shaft. A guide rail is provided on the connecting member, and the guide rail is slidably matched with the upper end of the fork. The sliding direction of the upper end of the fork in the guide rail is perpendicular to the axis of the main shaft and parallel to the swing surface of the fork.

3. The transmission shift actuator according to claim 2, characterized in that: The structure of the shift fork includes an intermediate rod and two extension rods, the two extension rods are respectively located at both ends of the intermediate rod and form a door-shaped structure with the intermediate rod, the intermediate rod is provided with a contact, the contact is slidably matched with the guide rail, and each extension rod is hinged to the base.

4. The transmission shift actuator according to claim 2, characterized in that: The main shaft is a screw, the connecting piece is threadedly connected to the main shaft, and the driver is used to drive the main shaft to rotate; The base is provided with a guide structure, which is slidably matched with the driving block and performs circumferential positioning of the driving block.

5. The transmission shift actuator according to claim 4, characterized in that: A pair of wing plates are arranged on the connecting member, a guide rail is formed between the two wing plates, the wing plates are slidably matched with the guide structure, and the driving block is circumferentially limited.

6. The transmission shift actuator according to claim 4, characterized in that: The driver is a motor, and the output end of the motor is drivingly connected to the main shaft.

7. The transmission shift actuator according to claim 4, characterized in that: The structure of the base includes a lower shell and an upper shell detachably connected to the lower shell, the lower shell is provided with a fork opening for passing the shift fork, two grooves are relatively arranged in the upper shell, and the guide structure includes two grooves, which are slidably matched with two sides of the driving block.

8. The transmission shift actuator according to claim 7, characterized in that: The driver is fixedly installed inside the upper shell.

9. The transmission shift actuator according to claim 1, characterized in that: A block-shaped fork foot is rotatably mounted on the lower end of the shift fork, and the fork foot contacts the slot on the synchronization device and is used to push the synchronization device to move when the shift fork swings.

10. A transmission, characterized in that: Comprising a transmission shift actuator as described in any one of claims 1-9.

Images