Gear shifting control mechanism and middle transmission

Abstract

The utility model relates to the technical field of transmissions, and provides a gear shifting control mechanism and a middle transmission. The utility model provides a gear shifting control mechanism. The gear shifting control mechanism comprises a transmission shaft, at least one gear, at least two spline sleeves and clutches, wherein the at least one gear is rotatably arranged on the transmission shaft in the circumferential direction; the at least two spline sleeves are fixedly arranged on the transmission shaft; each gear is locked with or separated from the transmission shaft through a clutch; and at least one of the at least two spline sleeves is detachably mounted on the transmission shaft. In the installation process, the spline sleeves and the gears are sequentially arranged on the transmission shaft in a penetrating mode according to the installation positions of the gears, installation can be completed, and therefore the installation process is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of transmissions, in particular to a gear shift control mechanism and a mid-mounted transmission. Background Art

[0002] In a mid-mounted transmission, a clutch is typically used to lock and release the drive shaft and gears, changing the transmission path and achieving speed changes. Therefore, different mounting methods are required to install the clutch and gears on the drive shaft, making the installation process relatively complex. Utility Model Content

[0003] The purpose of the utility model is to provide a gear shift control mechanism and a mid-mounted transmission, aiming to solve the technical problem of the relatively complicated transmission shaft installation process in the prior art.

[0004] In the first aspect, the present application provides a gear shift control mechanism, comprising a transmission shaft, at least one gear circumferentially rotatably mounted on the transmission shaft, at least two spline sleeves fixedly mounted on the transmission shaft, and a clutch circumferentially fixed and axially movably mounted on the spline sleeve; each of the gears is locked or separated from the transmission shaft by the clutch; at least one of the at least two spline sleeves is detachably mounted on the transmission shaft.

[0005] In one embodiment, the spline sleeve abuts against one side of the gear to limit the axial movement of the gear.

[0006] In one embodiment, the clutch is a dog clutch, and the dog clutch is used to be axially plug-fitted with the gear that abuts against the spline sleeve to lock or separate the gear from the transmission shaft.

[0007] In one embodiment, the at least two spline sleeves are a first spline sleeve and a second spline sleeve, and the number of the gears is 4, of which 2 gears are located at both ends of the first spline sleeve, and the other 2 gears are located at both ends of the second spline sleeve, and 2 of the 4 gears are located between the first spline sleeve and the second spline sleeve.

[0008] In one embodiment, the shift control mechanism further includes a drive assembly sleeved on the clutch, and the drive assembly is used to drive the clutch to move axially.

[0009] In one embodiment, the driving assembly includes a shift fork and a control member, the shift fork is used to be sleeved on the clutch, and the control member is used to drive the shift fork to move axially.

[0010] In one embodiment, the clutch is provided with an engaging groove extending along the circumferential direction, and the shift fork is installed in the engaging groove.

[0011] In one embodiment, both ends of the control member are connected to the shift fork for driving the shift fork so that both ends of the shift fork move synchronously along the axial direction.

[0012] In one embodiment, the control member includes two control shafts, and the two control shafts are respectively installed at two ends of the shift fork.

[0013] In a second aspect, the present application provides a mid-mounted transmission, comprising a shift control mechanism as described in the first aspect above.

[0014] The shift control mechanism provided by the present invention has the following beneficial effects: by fixedly mounting at least two splined sleeves on a drive shaft, a clutch is mounted on the splined sleeves in a circumferentially fixed and axially movable manner, and a gear is mounted on the drive shaft in a circumferentially rotatable manner. The clutch can be locked and released by axial movement of the splined sleeves on the drive shaft. At least one of the at least two splined sleeves is removably mounted on the drive shaft. Therefore, during installation, each splined sleeve and each gear can be sequentially threaded onto the drive shaft according to the gear's installation position, thereby simplifying the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 A schematic diagram of a shift control mechanism provided by an embodiment of the present utility model;

[0017] Figure 2 A schematic diagram of the assembly of a spline sleeve provided in an embodiment of the present utility model;

[0018] Figure 3 A schematic diagram of a shift control mechanism provided by another embodiment of the present utility model;

[0019] Figure 4 A schematic diagram of the assembly of a drive assembly provided in an embodiment of the present utility model;

[0020] Figure 5 A schematic diagram of a drive assembly provided in an embodiment of the present utility model;

[0021] Figure 6A schematic diagram of a drive assembly provided by an embodiment of the present invention from another perspective;

[0022] Figure 7 A schematic diagram of a connecting piece provided in an embodiment of the present utility model.

[0023] Among them, the reference numerals in the figures are:

[0024] 10. Transmission shaft; 20. Gear; 30. Spline sleeve; 31. First spline sleeve; 32. Second spline sleeve; 40. Clutch; 41. Engaging groove; 50. Drive assembly; 51. Shift fork; 511. First mounting hole; 512. Second mounting hole; 52. Control member; 521. Control shaft; 522. Positioning member; 5221. First positioning pin; 5222. Second positioning pin; 53. Connecting member; 531. First shift fork ring; 5311. First protrusion; 5312. First groove; 532. Second shift fork ring; 5321. Second groove; 5322. Fourth groove; 533. Third shift fork ring; 5331. Third protrusion; 5332. Third groove; 534. Connecting column; 54. Elastic member; 541. First elastic member; 542. Second elastic member. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 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 on the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0029] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] Please refer to Figure 1-7 Now, the shift control mechanism in the embodiment of the present utility model is described.

[0031] like Figure 1-2 As shown, the shift control mechanism includes a transmission shaft 10, at least one gear 20 rotatably mounted on the transmission shaft 10, at least two spline sleeves 30 fixedly mounted on the transmission shaft 10, and a clutch 40 fixed in the circumferential direction and axially movable on the spline sleeves 30. Each gear 20 is locked or released from the transmission shaft 10 via the clutch 40. At least one spline sleeve 30 of the at least two spline sleeves is detachably mounted on the transmission shaft 10. Specifically, because the clutch 40 is fixed in the circumferential direction and movable in the axial direction, and the gear 20 is rotatable in the circumferential direction, when the clutch 40 and the gear 20 are engaged, the clutch 40, the gear 20, and the transmission shaft 10 are combined into a single unit, thereby locking the gear 20 and the transmission shaft 10. When the clutch 40 and the gear 20 are not engaged, the gear 20 is released from the transmission shaft 10. Since at least one spline sleeve 30 is detachably mounted on the transmission shaft 10, the spline sleeve 30 can be installed after the gears are installed when assembling the transmission shaft 10. The installation can be completed by sequentially sleeve-mounting each gear 20 and each spline sleeve 30 on the transmission shaft 10 according to the position of the gear 20, thereby simplifying the installation process.

[0032] In one embodiment, the spline sleeve 30 abuts against one side of the gear 20 to limit the axial movement of the gear 20, so that the spline sleeve 30 circumferentially fixes the clutch 40 while limiting the axial movement of the gear 20, thereby eliminating the element for axially fixing the gear 20, saving the installation space of the gear 20, and further shortening the length of the transmission shaft 10.

[0033] In one embodiment, the clutch 40 is a dog clutch that is configured to engage axially with the gear 20 that abuts the splined sleeve 30 to lock or release the gear 20 from the transmission shaft 10. Therefore, the clutch 40 can be locked or released from the gear 20 by utilizing the rotational force of the transmission shaft 10, thereby reducing the difficulty of locking and releasing the clutch 40 and improving the secureness of the locked clutch 40 and gear 20.

[0034] In one embodiment, the clutch 40 is a bidirectional clutch that can lock and disengage the gears 20 located on either side of the clutch 40. For example, the clutch 40 is located between two gears 20. When the clutch 40 is in the middle position, it is disengaged from both gears 20. When the clutch 40 moves to one side, it locks with the gear 20 on the corresponding side. When the clutch 40 moves to the other side, it locks with the gear 20 on the other side. Compared to a one-way clutch, providing a bidirectional clutch can reduce the number of clutches 40 and shorten the length of the transmission shaft 10.

[0035] In one embodiment, the at least two spline sleeves 30 are a first spline sleeve 31 and a second spline sleeve 32. There are four gears 20, two of which are located at either end of the first spline sleeve 31, and another two are located at either end of the second spline sleeve 32. Two of the four gears 20 are located between the first spline sleeve 31 and the second spline sleeve 32. This design fully utilizes the limiting function of the spline sleeve 30, while allowing each clutch 40 to control the engagement and disengagement of the two gears 20 on either side, saving installation space.

[0036] In one embodiment, if Figures 3 to 7 As shown, the shift control mechanism further includes a drive assembly 50 sleeved on the clutch 40 , and the drive assembly 50 is used to drive the clutch 40 to move axially to achieve locking and separation of the clutch 40 and the gear 20 .

[0037] In one embodiment, the driving assembly 50 includes a shift fork 51 and a control member 52 . The shift fork 51 is used to be sleeved on the clutch 40 . The control member 52 is used to drive the shift fork 51 to move axially, thereby driving the clutch 40 to move axially.

[0038] In one embodiment, the clutch 40 is provided with a circumferentially extending engaging groove 41 , and the shift fork 51 is installed in the engaging groove 41 , so that the shift fork 51 is more firmly engaged with the clutch 40 , thereby improving the stability of the shift fork 51 during movement.

[0039] In one embodiment, both ends of the control member 52 are connected to the shift fork 51, and are used to drive the shift fork 51, causing both ends of the shift fork 51 to move axially synchronously. By synchronously moving both ends of the shift fork 51 to move the shift fork 51, the forces on both ends of the shift fork 51 are balanced, solving the cantilever problem of the shift fork 51, allowing the shift fork 51 to move axially more smoothly, and thereby improving the stability of the clutch 40 during movement.

[0040] In one embodiment, the shift fork 51 defines a first mounting hole 511 and a second mounting hole 512. The first mounting hole 511 and the second mounting hole 512 are connected. The first mounting hole 511 is larger than the outer diameter of the clutch 40, and the second mounting hole 512 is used to engage with the clutch 40. During assembly, the first mounting hole 511 is first inserted into the clutch 40, and then the clutch 40 is moved toward the second mounting hole 512 to engage the clutch 40 within the second mounting hole 512. This facilitates assembly and allows the shift fork 51 to more securely engage with the clutch 40.

[0041] In one embodiment, the control member 52 includes two control shafts 521 , which are respectively mounted at both ends of the shift fork 51 . By synchronously driving the two control shafts 521 , the two ends of the shift fork 51 can be driven to move synchronously.

[0042] In one embodiment, the control member 52 further includes a positioning member 522 mounted on the control shaft 521. The drive assembly 50 further includes a connecting member 53, which is axially movably mounted on the control shaft 521. The shift fork 51 is mounted on the connecting member 53. The connecting member 53 is provided with protrusions and / or grooves. During rotation, the control shaft 521 is configured to push the connecting member 53 to move by contacting the protrusions and / or grooves through the positioning member 522, thereby driving the shift fork 51 to move axially. The control shaft 521 is configured to rotate under the drive of an external force, for example, the control shaft 521 is driven to rotate by a gear, or the control shaft 521 is driven to rotate by a chain.

[0043] Specifically, because the positioning member 522 is mounted on the control shaft 521, the positioning member 522 moves circumferentially when the control shaft 521 rotates. As the positioning member 522 moves circumferentially, it abuts against the protrusions or grooves on the connecting member 53, thereby pushing the connecting member 53 in different axial directions, thereby driving the shift fork 51 and the clutch 40 in axial movement. Therefore, the shift fork 51 can be pushed axially by rotating the control shaft 521 without axially moving the control shaft 521. Consequently, the axial movement distance of the drive assembly 50 is reduced during the process of the shift fork 51 driving the clutch 40.

[0044] In one embodiment, the connecting member 53 includes a first shift fork ring 531, a second shift fork ring 532, and a third shift fork ring 533. The first shift fork ring 531, the second shift fork ring 532, and the third shift fork ring 533 are all axially movably mounted on the control shaft 521 and are each provided with a protrusion and / or a groove. The first shift fork ring 531 and the third shift fork ring 533 are respectively located at both ends of the second shift fork ring 532, and the first shift fork ring 531 and the third shift fork ring 533 are connected, and the shift fork 51 is mounted on the second shift fork ring 532. The positioning member 522 is used to push the first shift fork ring 531, the second shift fork ring 532, and the third shift fork ring 533 in the same direction or opposite directions to drive the shift fork 51 to move axially. The positioning member 522 pushes the protrusion or groove on the first shift fork ring 531 to move the first shift fork ring 531, the positioning member 522 pushes the protrusion or groove on the second shift fork ring 532 to move the second shift fork ring 532, and the positioning member 522 pushes the protrusion or groove on the third shift fork ring 533 to move the third shift fork ring 533. For example, by designing the position of the protrusions or grooves on the first shift fork ring 531, the second shift fork ring 532, and the third shift fork ring 533, the positioning member 522 can push the first shift fork ring 531 and the third shift fork ring 533 to move in the same direction, or the positioning member 522 can push the first shift fork ring 531 and the second shift fork ring 532 to move in opposite directions. By providing multiple shift fork rings, the need for the shift fork 51 to move in different directions and over different distances can be met.

[0045] In one embodiment, the first shift fork ring 531 is provided with a first protrusion 5311, and the second shift fork ring 532 is provided with a second groove 5321 on one side. The first protrusion 5311 and the second groove 5321 are arranged opposite each other. The positioning member 522 is configured to sequentially contact the first protrusion 5311 and the second groove 5321 during rotation of the control shaft 521, thereby pushing the shift fork 51 to move sideways from its initial position. Furthermore, the positioning member 522 is configured to sequentially move away from the second groove 5321 and the first protrusion 5311 during rotation of the control shaft 521, thereby pushing the shift fork 51 back to its initial position. Specifically, during rotation of the control shaft 521 in a first direction (clockwise or counterclockwise), the positioning member 522 first contacts the first protrusion 5311, thereby pushing the first shift fork ring 531 away from the second shift fork ring 532. Since the first shift fork ring 531 and the third shift fork ring 533 are fixedly connected, the first shift fork ring 531 drives the third shift fork ring 533 toward the second shift fork ring 532. The control shaft 521 then continues to rotate, causing the positioning member 522 to contact the second groove 5321, thereby causing the second shift fork ring 532 and the shift fork 51 to move synchronously toward the first shift fork ring 531. As the control shaft 521 rotates in a second direction opposite to the first direction, the positioning member 522 first leaves the second groove 5321, pushing the second shift fork ring 532 and the shift fork 51 away from the first shift fork ring 531 until they return to their initial position. The control shaft 521 then continues to rotate, causing the positioning member 522 to leave the first protrusion 5311, thereby returning the first shift fork ring 531 and the third shift fork ring 533 to their initial positions. The cooperation between the first and second shift fork rings 531, 532, allows the shift fork 51 to move in opposite directions, thereby causing the clutch 40 to move in opposite directions, enabling shifting in and out of gear.

[0046] In one embodiment, the third shift fork ring 533 is provided with a third protrusion 5331, and the second shift fork ring 532 is provided with a fourth groove 5322 on the other side thereof. The third protrusion 5331 and the fourth groove 5322 are arranged opposite each other. The positioning member 522 is configured to sequentially contact the third protrusion 5331 and the fourth groove 5322 during rotation of the control shaft 521, thereby pushing the shift fork 51 from its initial position to the other side. Furthermore, the positioning member 522 is configured to sequentially move away from the fourth groove 5322 and the third protrusion 5331 during rotation of the control shaft 521, thereby pushing the shift fork 51 back to its initial position. Specifically, during rotation of the control shaft 521 in the second direction, the positioning member 522 first contacts the third protrusion 5331, thereby pushing the third shift fork ring 533 away from the second shift fork ring 532. Since the first and third shift fork rings 531 and 533 are fixedly connected, the third shift fork ring 533 drives the first shift fork ring 531 toward the second shift fork ring 532. The control shaft 521 then continues to rotate, causing the positioning member 522 to contact the fourth groove 5322, thereby causing the second shift fork ring 532 and the shift fork 51 to move synchronously toward the third shift fork ring 533. During the rotation of the control shaft 521 in the first direction, the positioning member 522 first leaves the fourth groove 5322, thereby pushing the second shift fork ring 532 and the shift fork 51 to move synchronously away from the third shift fork ring 533 until they return to their initial position. The control shaft 521 then continues to rotate, causing the positioning member 522 to leave the third protrusion 5331, thereby returning the third shift fork ring 533 and the first shift fork ring 531 to their initial positions. The cooperation between the third shift fork ring 533 and the second shift fork ring 532 allows the shift fork 51 to move in opposite directions, thereby causing the clutch 40 to move in opposite directions, enabling shifting in and out of gear. Through the first shift fork ring 531 , the second shift fork ring 532 and the third shift fork ring 533 , the shift fork 51 can drive the clutch 40 to engage or disengage with elements (such as gears) on both sides of the clutch 40 , thereby saving space occupied by the clutch 40 .

[0047] In one embodiment, the positioning member 522 includes a first positioning pin 5221 and a second positioning pin 5222. The first positioning pin 5221 is located between the first shift fork ring 531 and the second shift fork ring 532, and the second positioning pin 5222 is located between the second shift fork ring 532 and the third shift fork ring 533. The first positioning pin 5221 is configured to sequentially contact the first protrusion 5311 and the second groove 5321 during rotation of the control shaft 521 to push the shift fork 51 to one side from its initial position, and to sequentially leave the second groove 5321 and the first protrusion 5311 during rotation of the control shaft 521 to push the shift fork 51 back to its initial position. The second positioning pin 5222 is configured to sequentially contact the third protrusion 5331 and the fourth groove 5322 during rotation of the control shaft 521 to push the shift fork 51 to the other side from its initial position, and to sequentially leave the fourth groove 5322 and the third protrusion 5331 during rotation of the control shaft 521 to push the shift fork 51 back to its initial position. The first positioning pin 5221 and the second positioning pin 5222 correspond to shifting in and out of gear in two directions, respectively, so that the clutch 40 controlled by the shift fork can be shifted in and out of gear more accurately.

[0048] It can be understood that the third shift fork ring 533 is provided with a third groove 5332 corresponding to the first protrusion 5311 on the first shift fork ring 531, so that the first positioning pin 5221 can push the first shift fork ring 531 to move while simultaneously driving the third shift fork ring 533 to move synchronously. The first shift fork ring 531 is provided with a first groove 5312 corresponding to the third protrusion 5331 on the third shift fork ring 533, so that the second positioning pin 5222 can push the third shift fork ring 533 to move while simultaneously driving the first shift fork ring 531 to move synchronously.

[0049] In one embodiment, the drive assembly 50 also includes an elastic member 54 whose two ends respectively contact the connecting member 53 and the fork 51. The elastic member 54 is configured to be in a compressed state when the positioning member 522 pushes the connecting member 53, thereby pushing the fork 51 or the connecting member 53 to move when returning to a normal state, thereby providing a restoring force for the connecting member 53 when the positioning member 522 pushes the connecting member 53, thereby reducing the impact when shifting gears or shifting gears.

[0050] In one embodiment, the connecting member 53 also includes a connecting column 534, which is passed through the fork 51 and has its two ends connected to the first fork ring 531 and the third fork ring 533 respectively, thereby enabling a stable connection between the connecting member 53 and the fork 51 and improving the stability of the fork 51 during movement.

[0051] In one embodiment, the elastic member 54 includes a first elastic member 541 and a second elastic member 542, which are sleeved on the connecting post 534. The two ends of the first elastic member 541 respectively contact the first shift fork ring 531 and one side of the shift fork 51, while the two ends of the second elastic member 542 respectively contact the third shift fork ring 533 and the other side of the shift fork 51, thereby providing restoring forces to the first shift fork ring 531 and the third shift fork ring 533, respectively. The elastic member 54 is a component that undergoes elastic deformation when subjected to a force and can return to its original state after the force is reduced or eliminated. For example, the elastic member 54 is a spring.

[0052] As the control shaft 521 rotates in the first direction, the first positioning pin 5221 first contacts the first protrusion 5311, thereby pushing the first shift fork ring 531 away from the second shift fork ring 532. Since the first shift fork ring 531 and the third shift fork ring 533 are fixedly connected, the first shift fork ring 531 drives the third shift fork ring 533 toward the second shift fork ring 532. At this time, the second shift fork ring 532 remains stationary, and the third shift fork ring 533 compresses the second elastic member 542. Subsequently, the control shaft 521 continues to rotate, causing the first positioning pin 5221 to contact the second groove 5321. The second elastic member 542 pushes the shift fork 51, causing the shift fork 51 to drive the second shift fork ring 532 toward the first shift fork ring 531, and the second elastic member 542 returns to its initial state. As the control shaft 521 rotates in the second direction, the first positioning pin 5221 first leaves the second groove 5321, thereby pushing the second shift fork ring 532 and the shift fork 51 to move synchronously away from the first shift fork ring 531. At this point, the first shift fork ring 531 and the third shift fork ring 533 remain stationary, and the shift fork 51 compresses the second elastic member 542. The control shaft 521 then continues to rotate, causing the first positioning pin 5221 to leave the first protrusion 5311, causing the second elastic member 542 to push the third shift fork ring 533 away from the second shift fork ring 532, simultaneously driving the first shift fork ring 531 toward the second shift fork ring 532. The second elastic member 542 returns to its initial state, and the first shift fork ring 531 and the third shift fork ring 533 return to their initial positions.

[0053] The shift fork 51 drives the second shift fork ring 532 toward the first shift fork ring 531, which can be used to drive the clutch 40 to engage a gear. That is, the gear is engaged under the push of the second elastic member 542. The first positioning pin 5221 pushes the second shift fork ring 532 and the shift fork 51 to move synchronously away from the first shift fork ring 531, which can be used to drive the clutch 40 to disengage a gear. Thus, the gear is engaged through a non-rigid connection (soft connection), thereby better integrating the clutch 40 with adjacent components. At the same time, the rigid connection (i.e., directly pushing the shift fork 51) to disengage the gear increases the speed of disengagement.

[0054] As the control shaft 521 rotates in the second direction, the second positioning pin 5222 first contacts the third protrusion 5331, thereby pushing the third shift fork ring 533 away from the second shift fork ring 532. Since the first and third shift fork rings 531 and 533 are fixedly connected, the third shift fork ring 533 drives the first shift fork ring 531 toward the second shift fork ring 532. At this time, the second shift fork ring 532 remains stationary, and the first shift fork ring 531 compresses the first elastic member 541. Subsequently, the control shaft 521 continues to rotate, causing the second positioning pin 5222 to contact the fourth groove 5322. The first elastic member 541 pushes the shift fork 51, causing the shift fork 51 to drive the second shift fork ring 532 toward the third shift fork ring 533. As the control shaft 521 rotates in the first direction, the positioning member 522 first leaves the fourth groove 5322, thereby pushing the second shift fork ring 532 to move away from the third shift fork ring 533. At this time, the first shift fork ring 531 and the third shift fork ring 533 remain stationary, and the shift fork 51 compresses the first elastic member 541. Thereafter, the control shaft 521 continues to rotate, causing the positioning member 522 to leave the third protrusion 5331, thereby causing the first elastic member 541 to push the first shift fork ring 531 away from the second shift fork ring 532 and drive the third shift fork ring 533 to move toward the second shift fork ring 532. The first elastic member 541 returns to its initial state, and the first shift fork ring 531 and the third shift fork ring 533 return to their initial positions.

[0055] The shift fork 51 drives the second shift fork ring 532 toward the third shift fork ring 533, which can be used to drive the clutch 40 to engage a gear. This is done by the first elastic member 541 pushing the second elastic member 541. The second positioning pin 5222 pushes the second shift fork ring 532 and the shift fork 51 to move synchronously away from the third shift fork ring 533, which can be used to drive the clutch 40 to disengage a gear. This allows for engagement through a non-rigid connection (soft connection), further improving the connection between the clutch 40 and adjacent components. Furthermore, the rigid connection (i.e., directly pushing the shift fork 51) increases the speed of disengagement.

[0056] In one embodiment, the number of connecting columns 534 is two, and the two connecting columns 534 are respectively located on both sides of the control shaft 521. Correspondingly, the number of first elastic members 541 and the number of second elastic members 542 are also two, so that the first fork ring 531 and the third fork ring 533 can be fixed at both ends, and the two connecting columns 534 are respectively arranged on both sides of the fork 51, thereby improving the stability of the fork movement process.

[0057] Another embodiment of the present invention further provides a mid-mounted transmission, comprising the above-mentioned shift control mechanism.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gear shift control mechanism, characterized in that: It includes a transmission shaft, at least one gear rotatably mounted on the transmission shaft, at least two spline sleeves fixedly mounted on the transmission shaft, and a clutch circumferentially fixed and axially movably mounted on the spline sleeve; each gear is locked or separated from the transmission shaft by the clutch; at least one spline sleeve of the at least two spline sleeves is detachably mounted on the transmission shaft.

2. The shift control mechanism according to claim 1, wherein: The spline sleeve abuts against one side of the gear to limit the gear from moving in the axial direction.

3. The shift control mechanism according to claim 2, characterized in that: The clutch is a tooth clutch, and the tooth clutch is used to be plugged and matched with the gear that abuts the spline sleeve along the axial direction, so that the gear is locked or separated from the transmission shaft.

4. The shift control mechanism according to claim 3, characterized in that: The at least two spline sleeves are a first spline sleeve and a second spline sleeve, and the number of gears is 4, of which 2 gears are located at both ends of the first spline sleeve, and the other 2 gears are located at both ends of the second spline sleeve, and 2 of the 4 gears are located between the first spline sleeve and the second spline sleeve.

5. The shift control mechanism according to claim 1, wherein: The shift control mechanism further includes a drive assembly sleeved on the clutch, and the drive assembly is used to drive the clutch to move axially.

6. The shift control mechanism according to claim 5, characterized in that: The driving assembly includes a shift fork and a control member. The shift fork is used to be sleeved on the clutch, and the control member is used to drive the shift fork to move axially.

7. The shift control mechanism according to claim 6, characterized in that: The clutch is provided with a clamping groove extending along the circumferential direction, and the shift fork is installed in the clamping groove.

8. The shift control mechanism according to claim 6, characterized in that: Both ends of the control member are connected to the shift fork and are used to drive the shift fork so that the two ends of the shift fork move synchronously along the axial direction.

9. The shift control mechanism according to claim 8, characterized in that: The control component includes two control shafts, and the two control shafts are respectively installed at two ends of the shift fork.

10. A mid-mounted transmission, characterized in that: The invention comprises a gear shift control mechanism according to any one of claims 1 to 9.

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