Shift actuator and gearbox system

Abstract

The application provides a shift actuator and a gearbox system. The shift actuator comprises a selection cylinder, a shift cylinder, a plurality of axially movable shift forks, a selection sleeve and a shift shaft assembly; the selection sleeve is connected with the selection cylinder, the shift shaft assembly is axially movably arranged in the selection sleeve and connected with the shift cylinder, the selection sleeve is provided with a flange, and the shift shaft assembly is provided with a shift head; the selection cylinder can push the selection sleeve and the shift shaft assembly to rotate along the circumference of the selection sleeve, so that the shift head is engaged with one of the plurality of shift forks in the axial direction of the selection sleeve and the flange is engaged with the remaining shift forks in the axial direction, and the shift cylinder can push the shift shaft assembly and the one shift fork engaged with the shift head to move in the axial direction. While realizing a compact structure, the application ensures accurate selection action and accurate shift action after selection, and improves shift accuracy and reliability.

Description

Technical Field

[0001] This application relates to the field of shifting technology, and more specifically, to shift actuators and transmission systems. Background Technology

[0002] In the transmissions of commercial vehicles and other vehicles, complex gear selection and shifting mechanisms are required to achieve multi-gear switching, resulting in existing gear selection and shifting mechanisms generally having complex structures and occupying a large amount of space. In addition, due to the increased number of components, the coordination and transmission design between components are complex, resulting in poor shifting accuracy and reliability.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This application provides a shift actuator and a transmission system to solve the problems of existing shift mechanisms being complex in structure, occupying a large space, and having poor shift accuracy and reliability.

[0005] According to one aspect of this application, a gear shifting actuator is provided, including a gear selection cylinder, a shift cylinder, a plurality of axially movable shift forks, a gear selection sleeve, and a shift shaft assembly; the gear selection sleeve is connected to the gear selection cylinder, the shift shaft assembly is axially movable and disposed in the gear selection sleeve and connected to the shift cylinder, the gear selection sleeve is provided with a flange, and the shift shaft assembly is provided with a shift head; the gear selection cylinder can push the gear selection sleeve and the shift shaft assembly to rotate circumferentially along the gear selection sleeve, so that the shift head engages axially with one of the plurality of shift forks and the flange engages axially with the remaining shift forks; the shift cylinder can push the shift shaft assembly and the shift fork engaged with the shift head to move axially.

[0006] In some embodiments, the shift shaft assembly includes a shift shaft connected to the piston rod of the shift cylinder and a dial fixedly connected to the shift shaft; the shift shaft is embedded in the gear selection sleeve, and the dial extends radially from the shift shaft and engages with the flange in the circumferential direction.

[0007] In some embodiments, the shift shaft is configured to be rotatably connected to the piston rod, or the piston rod is configured to be rotatable and axially movable.

[0008] In some embodiments, the flanges are two flanges spaced apart in the circumferential direction, the cylinder wall of the selector sleeve is provided with a guide groove extending along the axial direction, and the dial passes through the guide groove and is positioned between the two flanges in the circumferential direction.

[0009] In some embodiments, the gear selection cylinder is connected to the gear selection sleeve via a push rod; wherein, the outer wall of the gear selection sleeve is provided with a protrusion, the push rod is provided with a groove, the protrusion is embedded in the groove, so that the pushing and pulling motion of the push rod can be converted into the rotation of the gear selection sleeve and the gear shift shaft assembly along the circumferential direction.

[0010] In some embodiments, each shift fork is provided with a shift fork block, and each shift fork block is provided with a notch. In the neutral position of the plurality of shift forks, the notches of the plurality of shift forks are aligned. In the neutral position of the plurality of shift forks, as the shift cylinder pushes the shift sleeve and the shift shaft assembly to rotate circumferentially, the shift head enters the notch of the shift fork block of one of the shift forks so that the shift shaft assembly engages with the corresponding shift fork in the axial direction, and the flange enters the notch of the shift fork block of the remaining shift forks so that the remaining shift forks are locked in the axial direction by the flange.

[0011] In some embodiments, each shift fork is axially movable and sleeved on the shift fork shaft via a shift fork sleeve, and the shift fork block extends from the shift fork sleeve.

[0012] In some embodiments, the two ends of the gear selection sleeve are axially supported and limited by the gear shifting cylinder and the first fixed support, respectively.

[0013] In some embodiments, the cylinder wall of the gear selector sleeve is provided with a through hole, and a second fixed support is provided on the side of the gear selector sleeve. A spring pin is provided on the second fixed support, and the spring pin passes through the through hole and abuts against the gear shift shaft assembly.

[0014] In some embodiments, the plurality of shift forks are configured to a main transmission; the shift actuator further includes a range cylinder and a range shift fork configured to a range sub-transmission, the range cylinder being capable of operating the range shift fork.

[0015] In some embodiments, the shift actuator is configured for a transmission system having eight to ten forward gears, the transmission system having the main transmission and the range auxiliary transmission, the main transmission having four or five forward gears. Here, the total number of gears in the transmission system is obtained by multiplying the number of gears in the main transmission by the two gears in the range auxiliary transmission.

[0016] In some embodiments, the plurality of shift forks are three shift forks.

[0017] In some embodiments, the main transmission has five forward gears and one reverse gear, each of the three shift forks is assigned to two corresponding gears of the five forward gears and one reverse gear, and the main transmission and the range auxiliary transmission together provide ten forward gears, or provide nine forward gears with one forward gear discontinued.

[0018] In some embodiments, the main transmission has four forward gears and one reverse gear, two of the three shift forks are respectively assigned to two of the four forward gears, and the other of the three shift forks is assigned to the reverse gear, the main transmission and the range auxiliary transmission together provide eight forward gears.

[0019] In some embodiments, the gear selection cylinder, the gear shifting cylinder, and the range shifting cylinder are integrated in the same housing.

[0020] According to another aspect of this application, a transmission system is provided, the transmission system being configured with a shift actuator as described in any of the above embodiments.

[0021] In some embodiments, the transmission system is configured for use in commercial vehicles.

[0022] The advantages of this application compared to the prior art may include: The shift actuator of this application integrates a flanged shift sleeve with a shift shaft assembly with a paddle shifter, and the shift shaft assembly is rotatable relative to the shift sleeve. This achieves a compact structure while effectively decoupling the circumferential rotational shifting action from the axial movement shifting action. As the shift cylinder pushes the shift sleeve and shift shaft assembly to rotate, the paddle shifter engages with one shift fork, and the flange engages with the remaining shift forks, enabling the selection and locking of the shift forks. This ensures precise shifting action and accurate shifting action after selection, improving shifting accuracy and reliability.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1This diagram shows a structural schematic of the gear shifting actuator in an embodiment of this application; Figure 2 This diagram shows a cross-sectional view of the portion of the shift shaft assembly of the shift actuator in an embodiment of this application. Figure 3 This diagram shows an enlarged view of the gear selector sleeve of the gear shift actuator in an embodiment of this application. Figure 4 This is a cross-sectional view of the gear selector sleeve of the gear shift actuator in an embodiment of this application. Figure 5 This diagram shows the structural schematic of the gear selector sleeve in an embodiment of this application; Figure 6 This diagram illustrates the structure of the shift actuator integrated into the housing in an embodiment of this application. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to those described herein. Rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0027] The accompanying drawings are merely illustrative of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted.

[0028] The use of terms such as "first," "second," and similar words in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. The term "multiple" means two or more, unless otherwise explicitly specified. Furthermore, in the description of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, 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, or it can be a connection within two elements.

[0029] It should be noted that, unless otherwise specified, the embodiments of this application and the features in different embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] Figure 1 The structure of the gear shift actuator is shown. Figure 2 The diagram shows the cross-sectional structure of the part where the shift shaft assembly of the shift actuator is located. Figure 3This diagram illustrates an enlarged view of the area where the gear selector sleeve of the gear shift actuator is located. Figure 4 This diagram illustrates the cross-sectional structure of the gear selector sleeve portion of the gear shift actuator. (Combined with...) Figures 1 to 4 As shown, the shift actuator provided in this application embodiment may include: a gear selection cylinder 100, a shift cylinder 200, a plurality of axially movable shift forks (310, 320, 330), a gear selection sleeve 120, and a shift shaft assembly 220.

[0031] The gear selector sleeve 120 is connected to the gear selector cylinder 100. The gear shift shaft assembly 220 is axially movable in the gear selector sleeve 120 and connected to the gear shift cylinder 200. The gear selector sleeve 120 is provided with flanges (121, 122), and the gear shift shaft assembly 220 is provided with a dial 222.

[0032] The gear selector cylinder 100 can push the gear selector sleeve 120 and the gear shift shaft assembly 220 to rotate in the circumferential direction C of the gear selector sleeve 120, so that the shift head 222 engages with one of the multiple shift forks (310, 320, 330) in the axial direction Z of the gear selector sleeve 120, and the flange (121, 122) engages with the remaining shift forks (310, 320, 330) in the axial direction Z. The gear shift cylinder 200 can push the gear shift shaft assembly 220 and the shift fork engaged with the shift head 222 to move in the axial direction Z.

[0033] The gear selector cylinder 100 is used to push the gear selector sleeve 120 to rotate circumferentially C. The connection method or configuration of the gear selector cylinder 200 and the gear selector shaft assembly 220 allows the gear selector shaft assembly 220 to rotate, thereby decoupling the gear shifting action from the gear selection action. The flanges (121, 122) and the shift lever 222 engage circumferentially C, such that when the gear selector cylinder 100 pushes the gear selector sleeve 120 to rotate, the gear selector shaft assembly 220 rotates synchronously with the gear selector sleeve 120, thereby causing the shift lever 222 to rotate synchronously with the flanges (121, 122), causing the shift lever 222 to rotate to engage with one shift fork in the axial direction Z to realize the gear selection action, while the flanges (121, 122) rotate to engage with the remaining shift forks in the axial direction Z to axially lock these shift forks. The shift shaft assembly 220 is axially movable in the shift sleeve 120, so that the shift cylinder 200 can independently push the shift shaft assembly 220 and the shift fork engaged with the shift head 222 to move along the axial direction Z to realize the shifting action.

[0034] The shift actuator of this application integrates a selection sleeve 120 with flanges (121, 122) and a shift shaft assembly 220 with a shift lever 222. The flanges (121, 122) and the shift lever 222 engage in the circumferential direction C, and the shift shaft assembly 220 is rotatable. This achieves a compact structure while effectively decoupling the circumferential rotational shifting action from the axial movement shifting action. As the selection cylinder 100 pushes the selection sleeve 120 and the shift shaft assembly 220 to rotate, the shift lever 222 engages with one shift fork, and the flanges (121, 122) engage with the remaining shift forks. This design enables the selection and locking of multiple shift forks (310, 320, 330), ensuring precise selection and accurate shifting after selection, thus improving shifting accuracy and reliability.

[0035] In some embodiments, refer to Figure 2 and Figure 4 As shown, the shift shaft assembly 220 includes a shift shaft 221 connected to the piston rod 202 of the shift cylinder 200 and a dial 222 fixedly connected to the shift shaft 221; the shift shaft 221 is embedded in the shift sleeve 120, and the dial 222 extends radially from the shift shaft 221 and engages with the flanges (121, 122) in the circumferential direction C.

[0036] The shift shaft 221 and piston rod 202 can be rotatably connected, for example, through a low-friction rotary fit using components such as bearings and bushings. This allows the shift shaft 221 to rotate circumferentially (C) under the push of the shift cylinder 100 to complete the shifting action, and to move axially (Z) under the push of the shift cylinder 200 to complete the shifting action. Alternatively, the piston rod 202 itself can be configured to be rotatable and axially movable; in this case, the shift shaft 221 can be fixedly connected to the piston rod 202. The shift shaft 221 is embedded in the shift sleeve 120, achieving an axially movable fit with the shift sleeve 120 to ensure the straightness and stability of the shifting action. Specifically, the shift shaft 221 and the shift sleeve 120 can use keyed fit, clearance fit, or other methods to achieve circumferential (C) linkage and relative axial (Z) movement. The shift head 222 and the flanges (121, 122) can have a clearance fit.

[0037] Figure 5 The structure of the gear selector sleeve 120 is illustrated, combined with Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the flanges (121, 122) include a first flange 121 and a second flange 122 spaced apart in the circumferential direction C. The cylinder wall of the selector sleeve 120 is provided with a guide groove 126 extending in the axial direction Z. The dial 222 passes through the guide groove 126 and is positioned between the first flange 121 and the second flange 122 in the circumferential direction C.

[0038] The shift head 222 is clamped by a first flange 121 and a second flange 122. This allows the clamped shift head 222 to rotate synchronously with the shift sleeve 120 when it rotates, thus precisely aligning with different shift forks. Each shift selection ensures that the shift head 222 engages with one shift fork in the Z-axis direction, and the flanges (121, 122) engage with the remaining shift forks in the Z-axis direction. The guide groove 126 provides a channel for the shift head 222 to move along the Z-axis and restricts the shift head 222's circumferential freedom along the C-axis direction.

[0039] In some embodiments, combined with Figure 1 , Figures 3 to 5 As shown, the gear selection cylinder 100 is connected to the gear selection sleeve 120 via a push rod 110. The direction of movement of the push rod 110 can be perpendicular to the axis Z or at a predetermined angle.

[0040] The gear selector cylinder 100 and push rod 110 do not need to be set along the Z-axis. Instead, they can make full use of the internal space of the gear shift actuator and be arranged at the most reasonable angle and position, making the overall structure of the gear shift actuator compact and easy to lay out. The predetermined included angle can be any suitable angle greater than 0 degrees and less than 180 degrees. In some cases, the gear selector cylinder 100 and push rod 110 can also be set along the Z-axis.

[0041] Continue to combine Figure 1 , Figures 3 to 5 As shown, in some embodiments, the outer wall of the gear selector sleeve 120 is provided with a protrusion 123, and the push rod 110 is provided with a groove 113. The protrusion 123 is embedded in the groove 113, so that the pushing and pulling motion of the push rod 110 can be converted into the rotation of the gear selector sleeve 120 and the gear shift shaft assembly 220 in the circumferential direction C.

[0042] The push rod 110 and the gear selector sleeve 120 are securely connected by a protrusion 123 embedded in a groove 113, with the groove 113 hooking onto and clamping the protrusion 123, ensuring reliable transmission of rotational torque. The protrusion 123 can be dovetail-shaped, but is not limited to this, as long as a secure fit between the groove 113 and the protrusion 123 is achieved. Furthermore, in other embodiments, the push rod 110 and the gear selector sleeve 120 can also achieve transmission through other suitable methods such as snap-fit ​​or pin connection.

[0043] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4As shown, multiple shift forks (310, 320, 330) are each equipped with shift fork blocks (311, 321, 331), each shift fork block having a notch. At the neutral position of the multiple shift forks (310, 320, 330), the notches (312, 322, 332) of the multiple shift forks (310, 320, 330) are aligned; at the neutral position of the multiple shift forks (310, 320, 330)... As the gear selection cylinder 100 pushes the gear selection sleeve 120 and the shift shaft assembly 220 to rotate circumferentially C, the shift head 222 enters the notch of the shift fork block of one of the shift forks so that the shift shaft assembly 220 engages with the corresponding shift fork in the axial direction Z, and the flanges (121, 122) enter the notches of the shift fork blocks of the remaining shift forks so that the remaining shift forks are locked by the flanges (121, 122) in the axial direction Z.

[0044] The notches (312, 322, 332) are designed to provide clear and reliable positioning points for engagement and locking. The notches (312, 322, 332) of multiple shift forks (310, 320, 330) are aligned so that as the shift cylinder 100 pushes the shift sleeve 120 and shift shaft assembly 220 to rotate, the shift head 222 engages with the notch of one shift fork to achieve gear selection, while the flanges (121, 122) engage with the notches of the remaining shift forks to achieve locking. By utilizing the engagement of the shift head 222 with the notch, the thrust of the shift cylinder 200 can be directly transmitted to the corresponding shift fork via the shift shaft assembly 220 without the need for other components, ensuring efficient and accurate shifting.

[0045] In some embodiments, combined with Figure 1 and Figure 4 As shown, each shift fork is axially movable and mounted on the shift fork shaft 300 via a shift fork sleeve. Figure 1 The diagram shows the shift fork sleeve 313 of the first shift fork 310 and the shift fork sleeve 323 of the second shift fork 320, with shift fork blocks (311, 321, 331) extending from their respective shift fork sleeves.

[0046] The shift fork shaft 300 guides the axial movement of the shift forks (310, 320, 330) to ensure the linearity and load-bearing capacity of the shifting action. The shift fork blocks (311, 321, 331) reliably transmit the axial thrust from the shift head 222 to the shifting components (e.g., synchronizer sleeves) of the shift forks (310, 320, 330) via the corresponding shift fork sleeves. The shift fork blocks (311, 321, 331) and the shift fork sleeves can be integrally formed or fixedly connected to ensure continuous and efficient force transmission.

[0047] by Figure 1 and Figure 4Taking the illustrated structure as an example, the shift actuator includes three shift forks (310, 320, 330), each axially movably mounted on the fork shaft 300. The push rod 110 of the shift cylinder 100 is connected to the shift sleeve 120, which can drive the shift sleeve 120 to rotate to three different circumferential positions. Figure 1 and Figure 4 In the middle, the gear selector sleeve 120 is in a central position. At this time, the first flange 121 engages in the third notch 332 of the third shift fork block 331 of the third shift fork 330, and the second flange 122 engages in the first notch 312 of the first shift fork block 311 of the first shift fork 310, so that the first shift fork 310 and the third shift fork 330 are locked. The second notch 322 of the second shift fork block 321 of the second shift fork 320 engages with the shift head 222, so that the second shift fork 320 can be pushed by the shift cylinder 200 via the shift shaft assembly 220 to realize the shift action. When the gear selector sleeve 120 is rotated clockwise to a predetermined position by the gear selector cylinder 100, the first flange 121 engages with the second notch 322 of the second shift fork 320 and the third notch 332 of the third shift fork 330, thereby locking the second shift fork 320 and the third shift fork 330, while the shift head 222 engages with the first notch 312 of the first shift fork 310, so that the first shift fork 310 can be pushed by the shift cylinder 200 via the shift shaft assembly 220 to realize the shifting action. When the gear selector sleeve 120 is rotated counterclockwise to a predetermined position by the gear selector cylinder 100, the second flange 122 will engage in the first notch 312 of the first shift fork 310 and the second notch 322 of the second shift fork 320, thereby locking the first shift fork 310 and the second shift fork 320, while the shift head 222 engages in the third notch 332 of the third shift fork 330, thereby allowing the third shift fork 330 to be pushed by the shift cylinder 200 via the shift shaft assembly 220 to achieve the shifting action.

[0048] Furthermore, in some embodiments, combined with Figure 1 and Figure 2 As shown, the two ends of the gear selector sleeve 120 are axially supported and limited by the fixed shell 410 of the gear shift cylinder 200 and the first fixed support column 420, respectively.

[0049] The fixed housing 410 and the first fixed support column 420 can provide stable axial support for the gear selection sleeve 120 and restrict the axial movement of the gear selection sleeve 120. The two ends of the gear selection sleeve 120 can be fitted with the fixed housing 410 and the first fixed support column 420, for example, through bearings or clearance fits.

[0050] In some embodiments, refer to Figure 3As shown, the cylinder wall of the gear selector sleeve 120 is provided with a through hole 128 extending along the Z axis, and a second fixed support 430 is provided on the side of the gear selector sleeve 120. A spring pin 433 is provided on the second fixed support 430. The spring pin 433 passes through the through hole 128 and abuts against the gear shift shaft assembly 220.

[0051] The shift shaft assembly 220 is abutted by a spring pin 433 to maintain its position after the shifting action is completed, preventing axial movement and thus improving the stability and safety of the gear position. In addition, a sensor can be installed on the spring pin 433 to detect the axial position of the shift shaft assembly 220, so as to achieve precise control of the shifting action.

[0052] In some embodiments, refer to Figure 1 As shown, multiple shift forks (310, 320, 330) are provided to the main transmission; the shift actuator also includes a range cylinder 510 and a range shift fork 520 provided to the range auxiliary transmission. The range cylinder 510 can operate the range shift fork 520, for example, it can push the range shift fork 520 to move along the axial direction Z to control the gear range and realize high and low gear switching.

[0053] In some embodiments, a shift actuator is provided to a transmission system having eight to ten forward gears, the transmission system having a main transmission and a range auxiliary transmission, the main transmission having four or five forward gears. In this case, the plurality of shift forks (310, 320, 330) may be three shift forks, wherein the main transmission has four forward gears and one reverse gear, two of the three shift forks are respectively assigned to two of the four forward gears, and the other of the three shift forks is assigned to reverse gear, the main transmission and the range auxiliary transmission jointly providing eight forward gears. For example, the third shift fork 330 is assigned to the reverse gear, and the second shift fork 320 is assigned to a set of forward gears (first and second gears) and a set of forward gears (fifth and sixth gears). Switching between these two sets of forward gears is achieved by the range cylinder 510 operating the range cylinder 520. The first shift fork 310 is assigned to a set of forward gears (third and fourth gears) and a set of forward gears (seventh and eighth gears). Switching between these two sets of forward gears is also achieved by the range cylinder 510 operating the range cylinder 520. Alternatively, the main transmission has five forward gears and one reverse gear, and each of the three shift forks is assigned to two corresponding gears from the five forward gears and one reverse gear. The main transmission and the range auxiliary transmission together provide ten forward gears, or nine forward gears when one forward gear is discontinued. Taking a main transmission and a range auxiliary transmission that jointly provide ten forward gears as an example, among the three shift forks, the third shift fork 330 is equipped with reverse gear and forward first gear or forward sixth gear. The switching between forward first gear and forward sixth gear is achieved by the range cylinder 510 operating the range cylinder 520. The second shift fork 320 is equipped with a set of forward gears, forward second gear and forward third gear, and forward seventh gear and forward eighth gear. The switching between these two sets of forward gears is achieved by the range cylinder 510 operating the range cylinder 520. The first shift fork 310 is equipped with a set of forward gears, forward fourth gear and forward fifth gear, and forward ninth gear and forward tenth gear. The switching between these two sets of forward gears is achieved by the range cylinder 510 operating the range cylinder 520.

[0054] In addition to being configured with a medium-sized commercial vehicle transmission that provides eight to ten forward gears, the shift actuator can also be configured with a transmission system that has a different number of forward gears by adjusting the number of shift forks and the number of range sub-transmissions.

[0055] Figure 6 This diagram illustrates the structure of the shift actuator integrated into the housing, combined with... Figure 1 and Figure 6As shown, in some embodiments, the gear selection cylinder 100, the shift cylinder 200, and the range shift cylinder 510 are integrated in the same housing 600, achieving a high degree of structural integration of the shift actuator and simplifying installation and layout. The housing 600 may also house a controller and sensors (not specifically shown in the figure). The sensors include at least one of a position sensor, a speed sensor, and a temperature sensor. The controller is electrically connected to the sensors, the gear selection cylinder 100, the shift cylinder 200, and the range shift cylinder 510. The position sensor monitors parameters such as the rotation angle of the gear selection sleeve 120 (gear selection position), the axial position of the shift shaft 221, and the axial position of the range shift fork 520, and feeds this information back to the controller to ensure the accuracy of the shifting operation. The speed sensor monitors the engine speed (input shaft speed) and the vehicle speed (output shaft speed) and feeds this information back to the controller for smooth shifting. The temperature sensor monitors the temperature of the shift actuator and the transmission to provide overheat protection. A signal connector 660 may also be provided on the housing 600 to facilitate communication between the shift actuator and other components.

[0056] This application also provides a transmission system equipped with a shift actuator as described in any of the above embodiments. This system can effectively decouple the circumferential rotational gear selection action and the axial movement gear shifting action while achieving a compact structure, ensuring the accuracy of gear selection and subsequent gear shifting, and improving shifting precision and reliability.

[0057] In some embodiments, the transmission system configuration for commercial vehicles can provide layout flexibility in commercial vehicles and improve driving stability and safety through its compact structure and reliable shifting performance.

[0058] Finally, it should be noted that the above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A gear shifting actuator, comprising a gear selection cylinder, a gear shifting cylinder, and a plurality of axially movable shift forks, characterized in that, It also includes the gear selector sleeve and gear shift shaft assembly; The gear selection sleeve is connected to the gear selection cylinder, the gear shifting shaft assembly is axially movable in the gear selection sleeve and connected to the gear shifting cylinder, the gear selection sleeve is provided with a flange, and the gear shifting shaft assembly is provided with a dial head; The gear selection cylinder can drive the gear selection sleeve and the gear shift shaft assembly to rotate circumferentially along the gear selection sleeve, so that the shift head engages with one of the plurality of shift forks in the axial direction of the gear selection sleeve and the flange engages with the remaining shift forks in the axial direction of the plurality of shift forks. The gear shift cylinder can drive the gear shift shaft assembly and the shift fork engaged with the shift head to move along the axial direction.

2. The shift actuator as described in claim 1, characterized in that, The shift shaft assembly includes a shift shaft connected to the piston rod of the shift cylinder and a dial fixedly connected to the shift shaft; The shift shaft is embedded in the gear selection sleeve, and the dial extends radially from the shift shaft and engages with the flange in the circumferential direction.

3. The shift actuator as described in claim 2, characterized in that, The shift shaft is configured to be rotatably connected to the piston rod, or the piston rod is configured to be rotatable and axially movable.

4. The gear shifting actuator as described in claim 1, characterized in that, The flange consists of two flanges spaced apart in the circumferential direction. The cylinder wall of the selector sleeve is provided with a guide groove extending along the axial direction. The dial passes through the guide groove and is positioned between the two flanges in the circumferential direction.

5. The gear shifting actuator as described in claim 1, characterized in that, The gear selection cylinder is connected to the gear selection sleeve via a push rod; The outer wall of the gear selector sleeve is provided with a protrusion, and the push rod is provided with a groove. The protrusion is embedded in the groove, so that the pushing and pulling motion of the push rod can be converted into the rotation of the gear selector sleeve and the gear shift shaft assembly along the circumferential direction.

6. The shift actuator as described in claim 1, characterized in that, Each shift fork is provided with a shift fork block, and each shift fork block is provided with a notch. At the neutral position of the plurality of shift forks, the notches of the plurality of shift forks are aligned. In the neutral position of the plurality of shift forks, as the shift cylinder pushes the shift sleeve and the shift shaft assembly to rotate circumferentially, the shift head enters the notch of the shift fork block of one of the shift forks so that the shift shaft assembly engages with the corresponding shift fork in the axial direction, and the flange enters the notch of the shift fork block of the remaining shift forks so that the remaining shift forks are locked in the axial direction by the flange.

7. The shift actuator as described in claim 6, characterized in that, Each shift fork is axially movable and fitted onto the shift fork shaft via a shift fork sleeve, and the shift fork block extends from the shift fork sleeve.

8. The shift actuator as described in claim 1, characterized in that, The two ends of the gear selection sleeve are axially supported and limited by the gear shifting cylinder and the first fixed support, respectively.

9. The shift actuator as described in claim 1, characterized in that, The cylinder wall of the gear selector sleeve is provided with a through hole, and a second fixed support is provided on the side of the gear selector sleeve. A spring pin is provided on the second fixed support, and the spring pin passes through the through hole and abuts against the gear shift shaft assembly.

10. The gear shifting actuator as described in claim 1, characterized in that, The plurality of shift forks are provided to the main transmission; The shift actuator further includes a range cylinder and a range shift fork configured for the range sub-transmission, wherein the range cylinder can operate the range shift fork.

11. The shift actuator as described in claim 10, characterized in that, The shift actuator is provided to a transmission system having eight to ten forward gears, the transmission system having the main transmission and the range auxiliary transmission, the main transmission having four or five forward gears.

12. The shift actuator as described in claim 11, characterized in that, The plurality of shift forks refers to three shift forks, wherein... - The main transmission has five forward gears and one reverse gear. Each of the three shift forks is assigned to two corresponding gears among the five forward gears and one reverse gear. The main transmission and the range auxiliary transmission together provide ten forward gears, or nine forward gears when one forward gear is discontinued; or - The main transmission has four forward gears and one reverse gear. Two of the three shift forks are respectively assigned to two of the four forward gears, and the other shift fork is assigned to the reverse gear. The main transmission and the range auxiliary transmission together provide eight forward gears.

13. The shift actuator as described in claim 10, characterized in that, The gear selection cylinder, the gear shifting cylinder, and the range shifting cylinder are integrated in the same housing.

14. A transmission system, characterized in that, The transmission system is equipped with a shift actuator as described in any one of claims 1 to 13.

15. The transmission system as claimed in claim 14, characterized in that, The transmission system is configured for commercial vehicles.

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