Gear locking mechanism of electric gear shifting transmission

Abstract

A gear locking device of an electric gear shifting transmission comprises a shifting fork shaft and gear shifting forks, the shifting fork shaft is a fixed shaft supported on a transmission shell, the gear shifting forks can be axially and movably matched with the shifting fork shaft in a sliding mode, a rotating shaft is provided with a gear shifting hub, the cylindrical face of the gear shifting hub is provided with gear shifting cam grooves, and the number of the gear shifting cam grooves is the same as that of the gear shifting forks. The gear shifting fork is in sliding fit with the gear shifting cam groove through an arranged guiding device, a driven gear is arranged on the rotating shaft, a driving gear is arranged on a motor shaft of the driving motor and meshed with the driven gear on the rotating shaft to transmit power to the rotating shaft, and the gear shifting hub drives the gear shifting fork to complete gear shifting motion. The gear locking mechanism comprises a gear component and a locking piece which serve as opponent pieces, one gear component is circumferentially fixed to the rotating shaft and rotates along with the rotating shaft, the other gear component is fixed to the transmission shell, the gear component is provided with a V-shaped gear groove, and the locking piece is matched with the V-shaped gear groove to lock gears.

Description

Technical Field

[0001] This utility model relates to the field of transmissions, and in particular to a locking mechanism for an electric shift transmission. Background Technology

[0002] The gear position locking mechanism of a transmission shift mechanism usually locks the displacement position of the shift fork shaft to achieve gear locking after shifting. The current gear position locking mechanism usually uses a steel ball locking mechanism to cooperate with the ball socket on the shift fork shaft to form a lock. For example, the prior art with publication number CN 111609127 A discloses a gear position locking mechanism 400 on the transmission housing 8. The gear position locking mechanism uses a loading spring and a locking steel ball 13 to cooperate with the locking recess 3a to form a gear position lock and uses electromagnetic force to unlock. The locking recess 3a is provided on the shift fork rod 3 (see paragraph

[0037] of the specification of the publication). In this gear position locking mechanism, the shift fork is fixedly connected to the shift fork rod. A locking recess is provided on the shift fork rod along the axial direction. When the shift fork rod moves axially to shift gears, the locking steel ball is pushed into the locking recess by the spring to form a gear position lock. For example, in the prior art disclosed in CN 103615533 A, the technical solution is as follows: "The shift fork shaft 1 has a groove 3, and a blind hole 4 is provided on the side of the shift fork body 2 near the groove 3. A spring 5 and a locking ball 6 placed on the spring 5 are provided in the blind hole 4... The groove 3 and the blind hole 4 are both arranged along the axial direction of the shift fork shaft 1, and the two blind holes 4 correspond to the two grooves 3 respectively. The locking ball 6 is a steel ball, and the groove 3 is an annular groove" (see paragraph

[0012] of the specification of the disclosure text). This gear locking mechanism has multiple grooves arranged along the axial direction on the shift fork shaft, and multiple blind holes are provided at the sliding fit between the tail end of the shift fork body and the shift fork shaft. The springs assembled in the blind holes push the locking ball to cooperate with the grooves to form a gear lock. It is evident that existing technologies typically involve setting one shift fork on one shift fork shaft, with a gear positioning groove on the shift fork shaft. A steel ball locking mechanism works in conjunction with the gear positioning groove to lock the shift fork's movement position. If there are more than two gears, at least two shift forks are required, which means at least two shift fork shafts and corresponding gear locking mechanisms for each shift fork shaft. This results in a complex structure that is not conducive to multi-gear electric shift control. Summary of the Invention

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a locking mechanism for an electric shift transmission. This mechanism involves axially sliding a shift fork on a shift fork shaft, with a rotating shaft parallel to the shift fork shaft. A shift hub is mounted on the rotating shaft, and the shift fork engages with a shift cam groove on the shift hub via a guide device. A drive motor is connected to the rotating shaft via a reduction gear pair. A gear locking mechanism is located at one end of the rotating shaft, locking the gear position through the engagement of the gear position component and the locking element.

[0004] The purpose of this utility model is achieved as follows:

[0005] A locking device for an electric shift transmission includes a shift fork shaft and shift forks. The shift fork shaft is a fixed shaft supported on the transmission housing. The shift forks are axially movable and slidably fitted on the shift fork shaft. A rotating shaft is parallel to the shift fork shaft and supported on the transmission housing via bearings. A shift hub is disposed on the rotating shaft. The cylindrical surface of the shift hub has shift cam grooves. The number of shift cam grooves is the same as the number of shift forks. The shift forks are slidably fitted with the shift cam grooves via guide devices. A driven [transmission mechanism] is disposed on the rotating shaft. A gear and a drive motor are mounted on the transmission. A driving gear on the motor shaft meshes with a driven gear on the rotating shaft to transmit power to the rotating shaft. The shift fork is driven by the shift hub to complete the shifting motion. A gear locking mechanism is provided at one end of the rotating shaft. The gear locking mechanism includes a gear position component and a locking component as a counterpart. One component is circumferentially fixed on the rotating shaft and rotates with the rotating shaft, while the other is fixed on the transmission housing. The gear position component has a V-shaped gear position groove, and the locking component cooperates with the V-shaped gear position groove to lock the gear.

[0006] The gear shift component has a flange structure. The flange flange is fixedly connected to the transmission housing. Multiple V-shaped gear shift grooves are provided at the axial end of the annular boss extending axially from the flange. The locking member is circumferentially positioned on the rotating shaft and is axially movable. A compression spring is provided on the rotating shaft to abut against the locking member, so that the locking member cooperates with the V-shaped gear shift groove to lock the gear.

[0007] The locking element is an annular block, which is axially movable and circumferentially positioned on the rotating shaft. One end of the annular block abuts against a compression spring provided on the rotating shaft, and the other end is provided with a locking tooth for inserting into a V-shaped stop groove.

[0008] The locking element is a strip block, which is perpendicular to the rotating shaft and is circumferentially positioned in a strip hole that extends axially and penetrates radially on the rotating shaft. One long side of the strip block abuts against a compression spring on the rotating shaft, and the other long side is provided with locking teeth for inserting into a V-shaped stop groove.

[0009] The locking tooth is a notch provided on the other long side.

[0010] The gear shifting component is a ratchet structure mounted and fixed on the rotating shaft. Multiple V-shaped gear shifting grooves are arranged on the circumferential surface of the ratchet structure. The locking component is a pawl mounted on the transmission housing. A torsion spring is sleeved on the shaft of the pawl, with one end fixed to the pawl and the other end fixed to the transmission housing, so that the pawl can be engaged in the V-shaped gear shifting groove to lock the gear.

[0011] The shift fork is circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The guiding device is a guide pin, which is fixed to the tail of the shift fork and slides with the shift cam groove on the shift hub.

[0012] The guiding device includes a U-shaped bracket, a buffer spring, and a guide pin. The U-shaped bracket is circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The tail of the shift fork is located in the opening of the U-shaped bracket. Both the shift fork and the U-shaped bracket are circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The buffer spring is sleeved on the shift fork shaft and located between the side arm of the U-shaped bracket and the shift fork. The guide pin is fixed to the U-shaped bracket and slidesly engaged with the shift cam groove on the shift hub.

[0013] Two shift forks are provided on the shift fork shaft, and two shift cam grooves are provided on the cylindrical surface of the shift hub.

[0014] The diameter of the driving gear on the motor shaft is smaller than the diameter of the driven gear on the rotating shaft, forming a speed reduction transmission pair.

[0015] In the above solution, the shift fork shaft is a fixed shaft supported by the transmission housing. The shift fork is axially movable and slidably fitted on the shift fork shaft. This changes the existing technology where the shift fork shaft typically uses a rotating shaft or sliding shaft structure, allowing the shift fork on the fixed shaft to be driven by the shift hub to move along the shift fork shaft for gear shifting. A rotating shaft is parallel to the shift fork shaft, and a shift hub is provided on the rotating shaft. The cylindrical surface of the shift hub is provided with shift cam grooves, the number of which is the same as the number of shift forks. The shift fork slides in cooperation with the shift cam grooves through a guide device. In this way, the shift cam grooves on the cylindrical surface of the shift hub can drive the shift fork to move axially along the shift fork shaft for gear shifting. A driven gear is mounted on the rotating shaft, and a drive motor is mounted on the transmission. A driving gear on the motor shaft meshes with the driven gear on the rotating shaft, transmitting power to the shaft. This power drives the shift fork via the shift hub to complete the shifting motion. A gear locking mechanism is located at one end of the rotating shaft. This mechanism includes a gear position component and a locking component, one of which is circumferentially fixed to the rotating shaft and rotates with it, while the other is fixed to the transmission housing. The gear position component has a V-shaped gear position groove, and the locking component engages with this groove to lock the gear. Through the gear locking mechanism's engagement of the gear position component and locking component, one circumferentially fixed to the rotating shaft and rotating with it, and the other fixed to the transmission housing, when the rotating shaft rotates and drives the shift hub to complete the shifting motion, the locking component of the gear locking mechanism also inserts into the V-shaped gear position groove of the gear position component to lock the gear. This allows shifting and gear locking to be completed simultaneously.

[0016] The gear shift component has a flange structure, with the flange flange fixedly connected to the transmission housing. Multiple V-shaped gear shift grooves are located at the axial ends of an annular boss extending axially from the flange. The locking element is circumferentially positioned on the rotating shaft and is axially movable. A compression spring is mounted on the rotating shaft to abut the locking element, allowing the locking element to engage with the V-shaped gear shift grooves to lock the gear. This design allows the flange-structured gear shift component to be fixedly connected to the transmission housing with bolts, allows the rotating shaft to pass through the shaft hole of the flange and be supported by a bearing for flexible rotation, allows the locking element to insert into the V-shaped gear shift groove under the tension of the compression spring to form a gear lock, and allows the locking element to move from one V-shaped gear shift groove to another as the rotating shaft rotates, thus achieving gear shift locking.

[0017] The gear shifting component is a ratchet structure mounted and fixed on a rotating shaft. Multiple V-shaped gear shift grooves are arranged on the circumferential surface of the ratchet structure. The locking element is a pawl mounted on the transmission housing. A torsion spring is sleeved on the pawl's shaft, with one end fixed to the pawl and the other end fixed to the transmission housing, allowing the pawl to engage in the V-shaped gear shift grooves to lock the gear. The gear shifting component is a ratchet mounted and fixed on a rotating shaft, and the locking element is a pawl mounted on the transmission housing. During gear shifting, the ratchet rotates with the rotating shaft. When the gear is in position, the pawl, under the action of the torsion spring, engages in the V-shaped grooves on the circumferential surface of the ratchet to lock the gear.

[0018] This invention uses a drive motor to drive a rotating shaft, which in turn drives the shift hub to move the shift fork to complete the shifting. At the same time, the rotation of the rotating shaft causes the locking component to cooperate with the gear position component to form a lock. The structure is compact and reasonable.

[0019] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of another embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of another embodiment of the present utility model;

[0023] Figure 4 This is one embodiment of the guiding device of this utility model;

[0024] Figure 5 This is a structural diagram of the gear shift component of this utility model;

[0025] Figure 6 This is one embodiment of the locking component of this utility model;

[0026] Figure 7 This is another embodiment of the locking component of this utility model. Detailed Implementation

[0027] See Figures 1 to 7 A locking device for an electric shift transmission includes a transmission for a three- or four-wheeled motorcycle, a shift fork shaft 1, and shift forks 2. The shift fork shaft 1 is a fixed shaft supported on the transmission housing. The shift forks 2 are axially movable and slidably fitted on the shift fork shaft 1. A rotating shaft 3 is parallel to the shift fork shaft 1 and supported on the transmission housing via bearings. A shift hub 4 is provided on the rotating shaft 3. The cylindrical surface of the shift hub 4 is provided with shift cam grooves 5. The number of shift cam grooves 5 is the same as the number of shift forks 2. Two shift forks 2 are provided on the shift fork shaft 1, and two shift cam grooves 5 are provided on the cylindrical surface of the shift hub 4. The shift fork 2 is slidably engaged with the shift cam groove 5 via a guide device, which is a guide pin 6. The guide pin is fixed to the tail of the shift fork 2 and slidably engaged with the shift cam groove 5 on the shift hub 4. Alternatively, the guide device includes a U-shaped bracket 12, a buffer spring 13, and a guide pin 6. Two U-shaped brackets 12 are circumferentially positioned and axially movable, slidably engaged on the shift fork shaft 1. Each shift fork 2 has one U-shaped bracket 12, and the tail of the shift fork 2 is located in the opening of the U-shaped bracket 12. The shift fork 2 and the U-shaped bracket 12 are circumferentially positioned and axially movable, slidably engaged on the shift fork shaft 1. Circumferential positioning is achieved by setting circumferential positioning cuts on the shaft holes of the shift fork 2 and the U-shaped bracket 12, and setting an axially extending anti-rotation cut on the shift fork shaft 1, so that the shift fork 2 and the U-shaped bracket 12 form a circumferentially positioned and axially movable sliding engagement with the shift fork shaft 1 through the shaft holes. Or as... Figure 4As shown, the shift fork 2 is circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft 1. The U-shaped bracket 12 is slidably engaged with the shift fork shaft 1. The U-shaped bracket 12 is provided with a guide hole 12a. A guide bolt 20 is fixedly connected to the tail of the shift fork 2. The guide bolt 20 is clearance-fitted in the guide hole 12a to form a circumferential limit on the U-shaped bracket 12. The buffer spring 13 is sleeved on the shift fork shaft 1 and is located between the side arm of the U-shaped bracket 12 and the shift fork 2. The guide pin 6 is fixed to the U-shaped bracket 12 and slidably engaged with the shift cam groove 5 on the shift hub 4. All of these can realize the driving of the shift fork 2 to move axially along the shift fork shaft 1 for shifting. A driven gear 7 is provided on the rotating shaft 3, and a drive motor 8 is mounted on the transmission. A driving gear 9 is provided on the motor shaft of the drive motor 8, which meshes with the driven gear 7 on the rotating shaft 3 to transmit power to the rotating shaft 3. The diameter of the driving gear 9 on the motor shaft is smaller than the diameter of the driven gear 7 on the rotating shaft 3, forming a reduction transmission pair. The power output by the drive motor 8 is transmitted to the rotating shaft 3 through the reduction transmission pair. The rotating shaft 3 drives the shift fork 2 through the shift hub 4 to complete the shifting motion. A gear locking mechanism is provided at one end of the rotating shaft 3. The gear locking mechanism includes a gear position component 10 and a locking component 11 as a counterpart. One of them is circumferentially fixed on the rotating shaft 3 and rotates with the rotating shaft, while the other is fixed on the transmission housing. The gear position component 10 is provided with a V-shaped gear position groove 10a, and the locking component 11 cooperates with the V-shaped gear position groove 10a to lock the gear.

[0028] like Figure 1 In one embodiment, the gear shift component 10 has a flange structure. The flange flange is fixedly connected to the transmission housing by bolts. Multiple V-shaped gear shift grooves 10a are provided at the axial ends of the annular boss 10b extending axially from the flange. The number of V-shaped gear shift grooves 10a is the same as the number of gears provided in the transmission. A locking member 11 is circumferentially positioned on the rotating shaft 3 and is axially movable. The locking member 11 is an annular block. Both the shaft hole of the annular block and the rotating shaft 3 are provided with anti-rotation cutting flats, so that the annular block is circumferentially positioned on the rotating shaft 3 through the shaft hole. A locking tooth 15 with a guide slope is provided at the end of the annular block facing the gear shift component 10. A compression spring 14 is provided on the rotating shaft to abut against the locking member 11, so that the locking tooth 15 on the locking member 11 cooperates with the V-shaped gear shift grooves 10a of the gear shift component 10. When shifting gears, the locking tooth 15 is inserted into the corresponding V-shaped gear shift groove 10a to lock the gear.

[0029] like Figure 2In one embodiment, the gear shifting component 10 has a flange structure. The flange flange is fixedly connected to the transmission housing by bolts. Multiple V-shaped gear shifting grooves 10a are provided at the axial ends of the annular boss 10b extending axially from the flange. The number of V-shaped gear shifting grooves 10a is the same as the number of gears provided in the transmission. A strip-shaped hole 16 extending axially and penetrating radially is provided on the rotating shaft 3. The locking member 11 is a strip-shaped block. The strip-shaped block is perpendicular to the rotating shaft 3 and is circumferentially positioned in the strip-shaped hole 16 provided on the rotating shaft 3. Both ends of the strip-shaped block extend outward from the strip-shaped hole 16 on the rotating shaft 3. One long side of the strip-shaped block abuts against a compression spring 14 provided on the rotating shaft, and the other long side is provided with locking teeth 15 for inserting into the V-shaped gear shifting grooves 10a. The locking teeth 15 are notches provided on the long side.

[0030] like Figure 3 In one embodiment shown, the gear shifting component is a ratchet structure 17 mounted and fixed on the rotating shaft 3. Multiple V-shaped gear shifting grooves 10a are arranged on the circumferential surface of the ratchet structure 17. The locking component is a pawl 18 mounted on the transmission housing. A torsion spring 19 is sleeved on the shaft of the pawl 18. One end of the torsion spring 19 is fixed to the pawl, and the other end is fixed to the transmission housing, so that the pawl 18 is engaged in the V-shaped gear shifting groove 10a to lock the gear.

[0031] When shifting gears, the drive motor 8 drives the rotating shaft 3 to rotate the shift hub 4. The shift cam groove 5 of the shift hub 4 drives the shift fork 2 through the guide device 6 to engage the shift engagement sleeve with the target gear, transmitting the gear power. At the same time, the rotating shaft 3 drives the locking member 11 of the gear locking mechanism to rotate with the rotating shaft. The compression spring 14 causes the locking teeth 15 of the locking member to insert into the V-shaped gear slot 10a on the gear position component 10 corresponding to the target gear position, thereby completing one gear lock. When shifting gears again is required, the drive motor 8 drives the rotating shaft 3 to drive the shift hub 4 through the guide device 6 to drive the shift fork 2 to engage the shift engagement sleeve with the target gear. At the same time, the rotating shaft 3 drives the locking member 11 to rotate with the rotating shaft. The locking teeth 15 of the locking member 11 slide out of the V-shaped gear slot 10a under the force along the inclined plane until they move to another V-shaped gear slot. Under the action of the compression spring 14, the locking teeth 15 insert into the V-shaped gear slot to complete the gear lock of the target gear position.

Claims

1. A locking mechanism for an electric shift transmission, comprising a shift fork shaft and a shift fork, characterized in that: The shift fork shaft is a fixed shaft supported by the transmission housing. The shift fork is axially movable and slidably fitted on the shift fork shaft. A rotating shaft is parallel to the shift fork shaft and supported on the transmission housing by bearings. A shift hub is provided on the rotating shaft. The cylindrical surface of the shift hub is provided with shift cam grooves. The number of shift cam grooves is the same as the number of shift forks. The shift forks are slidably fitted with the shift cam grooves through a guide device. A driven gear is provided on the rotating shaft. A drive motor is mounted on the transmission. A driving gear is provided on the motor shaft of the drive motor and meshes with the driven gear on the rotating shaft to transmit power to the rotating shaft. The shift hub drives the shift forks to complete the shifting motion. A gear locking mechanism is provided at one end of the rotating shaft. The gear locking mechanism includes a gear position component and a locking component as a counterpart. One component is circumferentially fixed on the rotating shaft and rotates with the rotating shaft. The other component is fixed on the transmission housing. The gear position component is provided with a V-shaped gear position groove. The locking component cooperates with the V-shaped gear position groove to lock the gear.

2. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: The gear shift component has a flange structure. The flange flange is fixedly connected to the transmission housing. Multiple V-shaped gear shift grooves are provided at the axial end of the annular boss extending axially from the flange. The locking member is circumferentially positioned on the rotating shaft and is axially movable. A compression spring is provided on the rotating shaft to abut against the locking member, so that the locking member cooperates with the V-shaped gear shift groove to lock the gear.

3. The locking mechanism of the electric shift transmission according to claim 2, characterized in that: The locking element is an annular block, which is axially movable and circumferentially positioned on the rotating shaft. One end of the annular block abuts against a compression spring provided on the rotating shaft, and the other end is provided with a locking tooth for inserting into a V-shaped stop groove.

4. The locking mechanism of the electric shift transmission according to claim 2, characterized in that: The locking element is a strip block, which is perpendicular to the rotating shaft and is circumferentially positioned in a strip hole that extends axially and penetrates radially on the rotating shaft. One long side of the strip block abuts against a compression spring on the rotating shaft, and the other long side is provided with locking teeth for inserting into a V-shaped stop groove.

5. The locking mechanism of the electric shift transmission according to claim 4, characterized in that: The locking tooth is a notch provided on the other long side.

6. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: The gear shifting component is a ratchet structure mounted and fixed on a rotating shaft. Multiple V-shaped gear shifting grooves are arranged on the circumferential surface of the ratchet structure. The locking component is a pawl mounted on the transmission housing. A torsion spring is sleeved on the shaft of the pawl, with one end fixed to the pawl and the other end fixed to the transmission housing, so that the pawl can be engaged in the V-shaped gear shifting groove to lock the gear.

7. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: The shift fork is circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The guiding device is a guide pin, which is fixed to the tail of the shift fork and slides with the shift cam groove on the shift hub.

8. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: The guiding device includes a U-shaped bracket, a buffer spring, and a guide pin. The U-shaped bracket is circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The tail of the shift fork is located in the opening of the U-shaped bracket. Both the shift fork and the U-shaped bracket are circumferentially positioned and axially movable, slidingly engaged with the shift fork shaft. The buffer spring is sleeved on the shift fork shaft and located between the side arm of the U-shaped bracket and the shift fork. The guide pin is fixed to the U-shaped bracket and slidesly engaged with the shift cam groove on the shift hub.

9. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: Two shift forks are provided on the shift fork shaft, and two shift cam grooves are provided on the cylindrical surface of the shift hub.

10. The locking mechanism of the electric shift transmission according to claim 1, characterized in that: The diameter of the driving gear on the motor shaft is smaller than the diameter of the driven gear on the rotating shaft, forming a speed reduction transmission pair.

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