A new type of motorcycle gear shifting actuator

Abstract

This utility model relates to the field of motorcycle technology and discloses a novel motorcycle gear shifting actuator, including a gear shifting motor, a gear shift drum, and a shift fork. The outer wall of the gear shift drum is provided with gear shifting profile lines connected to the shift fork. The key feature is that the output shaft of the gear shifting motor meshes with the driven gear of the gear shift drum via a double-tooth bridge. An angle sensor is connected to the driven gear of the gear shift drum. A positioning assembly is provided on the gear shift drum, which limits the gear shifting of the gear shift drum to different positions. This mechanism has the advantages of high transmission efficiency, high precision, small size, and low noise, and also effectively solves the problem of shifting jerking caused by gear shifting mechanisms.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle technology, specifically to a novel motorcycle gear shifting actuator. Background Technology

[0002] The gear shifting mechanism of a motorcycle is a mechanical system that transmits the rider's foot movements (stepping or flicking) to the inside of the gearbox, thereby changing the gear engagement state. The traditional mechanical linkage device can be simplified as follows: stepping / flicking the gear shift lever → force is transmitted through the linkage → the shift drum rotates → the shift fork moves → gears engage / disengage.

[0003] Chinese patent document CN207670602U discloses an electronic shift control system for motorcycles, including a clutch and a gear drum. The system further includes a shift mechanism and a clutch disengagement mechanism. The shift mechanism is connected to one end of the gear drum, and the clutch disengagement mechanism is connected to one end of the shift mechanism and the other end of the clutch. The shift mechanism includes a shift arm spindle, a shift plate assembly with one end loosely fitted on the shift arm spindle, and a shift arm return arm with one end fixed to the shift arm spindle. A shift arm upper arm, a shift paddle, and a shift arm return spring are sequentially arranged on the shift plate assembly. A shift paddle connected to the shift arm upper arm is provided at one end of the shift arm upper arm, and the shift paddle is connected to a five-star plate provided at one end of the gear drum. The other end of the shift arm upper arm is connected to the shift arm return arm during shifting. The shift arm return spring is connected to the shift arm upper arm, and the shift teeth are fixed on one end of the shift arm spindle.

[0004] Traditional motorcycle gear shifting relies on manual operation by the rider, requiring coordination of the clutch and throttle with gear changes. This process is complex and has a low margin for error. Novice riders are prone to stalling or clutch wear due to shifting errors in complex road conditions (such as traffic jams, slopes, and rain), which ultimately affects driving safety. To lower the barrier to entry for riders and improve riding safety and comfort, the industry has developed automatic gear shifting mechanisms, the core of which is the use of electronically controlled shifting mechanisms to replace manual operation. However, existing automatic gear shifting structures for motorcycles suffer from problems such as large size, significant shift shock, and high shifting noise. Utility Model Content

[0005] To solve the aforementioned technical problems, this utility model provides a novel motorcycle gear shifting actuator, including a gear shifting motor, a gear shift drum, and a shift fork. The outer wall of the gear shift drum is provided with gear shift profile lines connected to the shift fork. The key feature is that the output shaft of the gear shifting motor meshes with the driven gear of the gear shift drum via a double-tooth bridge. An angle sensor is connected to the driven gear of the gear shift drum. A positioning assembly is provided on the gear shift drum, and the positioning assembly limits the gear shift of the gear shift drum to different positions.

[0006] To facilitate power transmission, the output shaft of the shift motor is an external spline output shaft.

[0007] Preferably, the double-tooth bridge includes a large tooth and a small tooth. The large tooth meshes with the external spline output shaft, and the small tooth meshes with the driven tooth of the transmission drum for power transmission.

[0008] To facilitate the angle sensor's detection and determination of whether a gear shift has been completed, the driven gear of the gear shift drum is provided with a flat square pin and a cylindrical pin hole. The flat square pin of the driven gear is inserted into the angle sensor's flat square pin hole for connection, and the cylindrical pin hole of the driven gear is connected to the gear shift drum's cylindrical pin hole through a cylindrical pin.

[0009] To prevent disengagement, the end of the gear shift drum is provided with a gear shift groove for the positioning assembly to engage.

[0010] Preferably, the positioning assembly includes a positioning bolt, a positioning spring, and a positioning steel ball. The positioning steel ball is vertically pressed against the gear shift groove of the gear drum by the positioning spring. The positioning spring is compressed and installed in the positioning bolt. The positioning bolt is tightened on the engine housing. When the gear drum rotates, the positioning steel ball switches to different positions in the gear shift groove of the gear drum to limit the gear drum.

[0011] Preferably, the shift forks are respectively provided with guide pins and shift fork holes, the guide pins are respectively inserted into the gear position profile of the gear drum, and the number of shift fork shafts is determined according to actual needs.

[0012] To facilitate the movement of the shift fork, the shift fork can move along the direction of the speed-changing drum on the shift fork shaft.

[0013] Furthermore, the shift fork shaft is arranged parallel to the gear shift drum, and the shift fork shaft is inserted into the shift fork hole of the shift fork. The shift fork shaft plays a role in guiding the movement of the shift fork. The two ends of the shift fork shaft are restricted from axial movement by the housing. The number of shift fork shafts is determined according to actual needs.

[0014] This utility model has the following beneficial effects: 1. This utility model adopts motor drive, which directly drives the gear drum to rotate through gear transmission, thereby driving the shift fork to push the gear teeth along the profile of the gear drum to change gears. It has high transmission efficiency and precision, and can effectively solve the problem of shift jerking caused by the shift mechanism. 2. This utility model eliminates the traditional shift arm, five-star plate, and positioning plate, which greatly saves the already compact internal space of the motorcycle engine. Moreover, the noise of gear transmission is much less than the noise generated by the shift arm, five-star plate, and positioning plate during operation, thus achieving the effect of reducing shifting noise. Attached Figure Description

[0015] Figure 1 This is an overall schematic diagram of the automatic gear shifting actuator for motorcycles according to this utility model; Figure 2 This is a schematic diagram of a gear shifting motor; Figure 3 This is a schematic diagram of a double-tooth bridge. Figure 4 A schematic diagram of the driven gear of the speed change drum; Figure 5 This is a schematic diagram of an angle sensor; Figure 6 This is a schematic diagram of a speed-changing drum. Figure 7 This is a schematic diagram of the positioning combination; Figure 8 This is a schematic diagram of the shift fork; Figure 9 This is a schematic diagram of the shift fork shaft. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings of the instruction manual include: 1. Shift motor; 101. External spline output shaft; 2. Double gear of bridge; 201. Large gear of double gear of bridge; 202. Small gear of double gear of bridge; 3. Driven gear of shift drum; 301. Flat square pin of shift drum driven gear; 302. Cylindrical pin hole of shift drum driven gear; 303. Angle sensor; 4. Angle sensor flat square pin hole; 401. Shift drum; 5. Shift drum cylindrical pin hole; 501. Shift drum gear profile; 502. Shift drum gear groove; 503. Positioning assembly; 6. Positioning bolt; 601. Positioning spring; 602. Positioning ball; 603. Shift fork; 7. Guide pin; 701. Shift fork hole; 8. Shift fork shaft.

[0017] Example 1 like Figure 1-9 As shown, a novel motorcycle gear shifting actuator includes a gear shifting motor 1, a double-linked gear 2, a driven gear 3 on the gear shift drum, an angle sensor 4, a gear shift drum 5, a positioning assembly 6, a shift fork 7, and a shift fork shaft 8. The outer wall of the gear shift drum 5 is provided with a gear shift profile 502 connected to the shift fork 7. The output shaft of the gear shifting motor 1 meshes with the driven gear 3 on the gear shift drum 5 via the double-linked gear 2. An angle sensor 4 is connected to the driven gear 3 on the gear shift drum. The gear shift drum 5 is provided with a positioning assembly 6, which limits the gear shifting of the gear shift drum 5 to different positions.

[0018] The output shaft of the shift motor 1 is an external spline output shaft 101. The double-gear bridge 2 includes two gears: a large gear 201 and a small gear 202. The large gear 201 meshes with the external spline output shaft 101, and the small gear 202 meshes with the driven gear 3 of the shift drum to transmit power.

[0019] The driven gear 3 of the gear change drum is provided with a flat square pin 301 and a cylindrical pin hole 302. The driven gear 3 of the gear change drum meshes with the large tooth 201 of the double-linked gear to transmit power. The flat square pin 301 of the driven gear of the gear change drum is inserted into the angle sensing flat square pin hole 401 of the angle sensor 4 for connection. The cylindrical pin hole 302 of the driven gear of the gear change drum is connected to the gear change drum 5 through a cylindrical pin 303.

[0020] The angle sensor 4 is provided with an angle sensing flat pin hole 401, which is installed on the driven tooth flat pin 301 of the gear shift drum to collect the rotation angle of the gear shift drum 5.

[0021] One end of the gear shift drum 5 is provided with a gear shift drum cylindrical pin hole 501, and the outer wall of the other end is provided with a gear shift drum gear slot 503. The gear shift drum cylindrical pin hole 501 is connected to the gear shift drum driven tooth cylindrical pin hole 302 of the gear shift drum driven tooth 3 by a cylindrical pin 303. The number of gear shift profiles 502 and gear shift drum gear slots 503 are designed according to the actual gear requirements.

[0022] The positioning assembly 6 includes a positioning bolt 601, a positioning spring 602, and a positioning steel ball 603. The positioning steel ball 603 is vertically pressed against the gear shift groove 503 of the gear shift drum by the positioning spring 602. The positioning spring 602 is compressed and installed in the positioning bolt 601. The positioning bolt 601 is tightened on the engine housing. When the gear shift drum 5 rotates, the positioning steel ball 603 switches to different positions in the gear shift groove 503 of the gear shift drum to limit the gear shift drum 5.

[0023] The shift forks 7 are respectively provided with guide pins 701 and shift fork holes 702. The guide pins 701 are respectively inserted into the gear position profile 502 of the gear drum. The number of shift forks 7 is determined according to the actual gear requirements.

[0024] The shift fork shaft 8 is arranged parallel to the gear shift drum 5. The shift fork shaft 8 is inserted into the shift fork hole 702 of the shift fork 7, and plays a role in guiding the movement of the shift fork 7. The two ends of the shift fork shaft 8 are restricted from axial movement by the housing. The number of shift fork shafts 8 is determined according to actual needs.

[0025] The gear shifting process is as follows: After judging the vehicle's operating condition, the motorcycle's TCU (Automatic Transmission Electronic Control Unit) issues a shift command (or the driver triggers the shift command through manual mode). The shift motor 1 rotates forward (or reverse). The external spline output shaft 101 of the shift motor 1 drives the double gear 2 meshing with it to rotate. The double gear 2 drives the driven gear 3 of the shift drum meshing with it to rotate. After overcoming the compression force of the positioning spring 602, the shift drum 5 rotates circumferentially under the connection of the cylindrical pin 303. At the same time, the positioning steel ball 603 also rotates accordingly. When the speed drum gear slot 503 rotates, the shift fork 7 moves axially along the gear profile 502 on the speed drum 5 under the action of the guide pin 701 and the shift fork hole 702, thereby driving the gear teeth to move axially to achieve the purpose of gear switching. The TCU determines whether the gear shift is completed by collecting the rotation angle through the angle sensor 4. After the set conditions are met, the gear shift motor 1 stops. At the same time as the gear shift is completed, the positioning steel ball 603 enters the next gear slot and is fixed in the gear position under the action of the positioning spring 602 compressed by the positioning bolt 601 to prevent disengagement. Thus, one gear shift is completed.

[0026] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A novel motorcycle gear shifting actuator, comprising a gear shifting motor, a gear shift drum, and a shift fork, wherein the outer wall of the gear shift drum is provided with gear shift lines that connect with the shift fork, characterized in that, The output shaft of the shift motor meshes with the driven gear of the shift drum via a double-tooth bridge. An angle sensor is connected to the driven gear of the shift drum. The shift drum is equipped with a positioning assembly, which limits the shift drum's gear shift to different positions.

2. The novel motorcycle gear shifting actuator according to claim 1, characterized in that: The output shaft of the shift motor is an external spline output shaft.

3. The novel motorcycle gear shifting actuator according to claim 2, characterized in that: The bridge double gear includes a large tooth and a small tooth. The large tooth meshes with the external spline output shaft, and the small tooth meshes with the driven tooth of the transmission drum to transmit power.

4. The novel motorcycle gear shifting actuator according to claim 3, characterized in that: The driven gear of the speed change drum is provided with a flat square pin and a cylindrical pin hole. The flat square pin of the driven gear is inserted into the angle sensing flat square pin hole of the angle sensor for connection. The cylindrical pin hole of the driven gear is connected to the cylindrical pin hole of the speed change drum through a cylindrical pin.

5. The novel motorcycle gear shifting actuator according to claim 4, characterized in that: The end of the gear shift drum is provided with a gear shift groove for the positioning assembly to be tightened.

6. The novel motorcycle gear shifting actuator according to claim 5, characterized in that: The positioning assembly includes a positioning bolt, a positioning spring, and a positioning steel ball. The positioning steel ball is vertically pressed against the gear shift groove of the gear drum by the positioning spring. The positioning spring is compressed and installed in the positioning bolt. The positioning bolt is tightened on the engine housing. When the gear drum rotates, the positioning steel ball switches to different positions in the gear shift groove of the gear drum to limit the gear drum.

7. The novel motorcycle gear shifting actuator according to claim 6, characterized in that: The shift forks are respectively provided with guide pins and shift fork holes, and the guide pins are respectively inserted into the gear position profile of the gear drum.

8. The novel motorcycle gear shifting actuator according to claim 7, characterized in that: The shift fork can move along the direction of the speed-changing drum on the shift fork shaft.

9. The novel motorcycle gear shifting actuator according to claim 8, characterized in that: The shift fork shaft is arranged parallel to the gear shift drum, and the shift fork shaft is inserted into the shift fork hole of the shift fork.

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