A bidirectional overrunning clutch, electric bicycle derailleur

Abstract

The application provides a bidirectional overrunning clutch and an electric bicycle transmission, and aims to solve the problems of insufficient climbing ability and low motor efficiency in high-speed driving in the prior art; the overrunning clutch can realize bidirectional combination, and the electric bicycle transmission can provide greater climbing ability, higher motor efficiency in high-speed driving, and reverse and energy recovery functions.

Description

Technical Field

[0001] This invention belongs to the field of overrunning clutches and electric bicycle design, specifically relating to a two-way overrunning clutch and electric bicycle transmission. Background Technology

[0002] Currently, the vast majority of electric bicycles on the market use single-speed hub motors, mainly gearless brushless motors and toothed brushless motors. Both have the advantages of high efficiency and energy saving, lightweight and compact design, easy installation, and good dynamic response. However, they also have their own disadvantages. For example, gearless brushless motors have the disadvantages of low torque and weak climbing ability, as well as low motor efficiency and high heat generation at high speeds. Toothed brushless motors do not have energy recovery and reverse gear functions. At the same time, a balance must be struck between climbing ability and high-speed motor efficiency. Therefore, it is necessary to add a gearbox function to the hub motor. Summary of the Invention

[0003] The purpose of this invention is to provide a two-way overrunning clutch and an electric bicycle gearbox, which aims to solve the problems of insufficient climbing ability and low efficiency of motors at high speeds in the prior art.

[0004] To achieve the above objectives, the present invention provides a bidirectional overrunning clutch, comprising a star wheel, a clutch fork assembly, and a reversing ring. The star wheel is uniformly provided with bidirectional wedge-shaped grooves, and mounting holes are uniformly provided on the star wheel, each uniquely corresponding to a bidirectional wedge-shaped groove. The central axis of the mounting hole is parallel to the central axis of the star wheel. A clutch fork assembly is mounted on the mounting hole, and the clutch fork assembly and the star wheel are clearance-fitted. The clutch fork assembly includes a connecting shaft, clutch fork I, clutch fork II, and a rotating shaft. Clutch fork I and clutch fork II are provided at both ends of the connecting shaft, and both clutch fork I and clutch fork II are provided with U-shaped grooves. A rotating shaft is provided at one end of the connecting shaft. The rotating shaft and the connecting shaft are coaxial. The rotating shaft has one or more threads. The reversing ring is a circular ring. The central axis of the reversing ring is coaxial with the central axis of the star wheel. The reversing ring has a number of reversing holes that are coaxial with the rotating shaft. The reversing holes have grooves. The number of grooves on a single reversing hole is equal to the number of threads on a single rotating shaft. A corresponding rotating shaft passes through each reversing hole. A corresponding thread passes through the groove of each reversing hole. The reversing ring can move axially on the star wheel.

[0005] Optionally, a spring hole is provided between the bidirectional wedge groove and the mounting hole of the star wheel. The central axis of the spring hole is parallel to the central axis of the star wheel. A positioning spring is provided in the middle of the spring hole, and positioning pins are provided at both ends of the spring hole. The top of the positioning pins is conical. In the clutch fork assembly, clutch fork I and clutch fork II are provided with three conical positioning holes evenly arranged on the side of the star wheel with the mounting hole as the center and the distance from the central axis of the mounting hole to the central axis of the spring hole as the radius.

[0006] This invention also provides a bidirectional overrunning clutch, comprising an outer ring, a clutch fork assembly, and a reversing ring. The outer ring is uniformly provided with bidirectional wedge-shaped grooves, and mounting holes are uniformly provided on the outer ring, each uniquely corresponding to a bidirectional wedge-shaped groove. The central axis of the mounting hole is parallel to the central axis of the outer ring. A clutch fork assembly is mounted on the mounting hole, and the clutch fork assembly and the outer ring are clearance-fitted. The clutch fork assembly includes a connecting shaft, clutch fork I, clutch fork II, and a rotating shaft. Clutch fork I and clutch fork II are provided at both ends of the connecting shaft, and both clutch fork I and clutch fork II are provided with U-shaped grooves. A rotating shaft is provided at one end of the connecting shaft. The shaft, the central axis of the rotating shaft and the central axis of the connecting shaft are coaxial. The rotating shaft is provided with one or more threads. The reversing ring is a circular ring. The central axis of the reversing ring and the central axis of the outer ring are coaxial. The reversing ring is evenly provided with the same number of coaxial reversing holes as the rotating shaft. The reversing holes are provided with grooves. The number of grooves on a single reversing hole is equal to the number of threads on a single rotating shaft. A corresponding rotating shaft passes through each reversing hole. A corresponding thread passes through the groove of each reversing hole. The reversing ring can move axially in the outer ring.

[0007] Optionally, a spring hole is provided between the bidirectional wedge groove and the mounting hole of the outer ring. The central axis of the spring hole is parallel to the central axis of the outer ring. A positioning spring is provided in the middle of the spring hole, and positioning pins are provided at both ends of the spring hole. The top of the positioning pins is conical. On the side of the clutch fork assembly, clutch fork I and clutch fork II near the outer ring, three conical positioning holes are evenly provided on a circle with the mounting hole as the center and the distance from the central axis of the mounting hole to the central axis of the spring hole as the radius.

[0008] The present invention also provides an electric bicycle transmission, including the above-described bidirectional overrunning clutch.

[0009] The present invention provides a two-way overrunning clutch and electric bicycle transmission, which can provide greater climbing ability, higher motor efficiency at high speeds, reverse gear and energy recovery functions, and has the advantages of simple structure and mature technology.

[0010] It should be noted that in the description of this invention, the terms "clockwise," "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not mean that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Attached Figure Description

[0011] Figure 1 This is a drawing of the star wheel components.

[0012] Figure 2 This is a part drawing of the clutch shift fork I, the connecting shaft, and the rotating shaft.

[0013] Figure 3 This is a part drawing of clutch shift fork II.

[0014] Figure 4 This is a structural diagram of the clutch shift fork assembly.

[0015] Figure 5 This is a drawing of the commutation ring component.

[0016] Figure 6 This is a magnified view of a portion of the commutation ring.

[0017] Figure 7 This is the structure of Example 1.

[0018] Figure 8 This is a partial enlarged view of the structure in Example 1.

[0019] Figure 9 Drawing of outer ring parts

[0020] Figure 10 This is the structure of Example 2.

[0021] Figure 11 This is a partial enlarged view of the structure in Example 2.

[0022] Figure 12 This is a schematic diagram of the structure of Example 3.

[0023] The reference numerals in the attached figures are as follows: 11-Star wheel; 12-Outer ring; 111-Double wedge groove; 112-Mounting hole; 113-Spring hole; 114-Positioning spring; 115-Positioning pin; 21-Connecting shaft; 211-D-type shaft; 212-Snap ring groove; 22-Clutch fork I; 221-Positioning hole; 222-U-groove; 23-Clutch fork II; 231-D-hole; 24-Rotating shaft; 241-Thread; 3-Reversing ring; 31-Reversing hole; 32-Groove; 4-Snap ring; 5-Roller; 6-Shift fork; 7-Planetary gear set; 8-Planetary support; 9-Motor; 91-Double gear; 101-Permanent magnet; 102-Electromagnet; 103-Guide rail; 104-Shift fork linkage. Specific Implementation like Figures 1-8 The image shows a specific embodiment 1 of the present invention, which provides a bidirectional overrunning clutch, comprising a star wheel 11, an outer ring 12, a clutch fork assembly, a reversing ring 3, a positioning assembly, and rollers 5; the star wheel 11 is uniformly provided with 12 bidirectional wedge grooves 111, 12 mounting holes 112, and 12 spring holes 113; the central axes of the mounting holes 112 and the spring holes 113 are parallel to the central axis of the star wheel 11; the midpoint of each corresponding bidirectional wedge groove 111, the center of the mounting hole 112, the center of the spring hole 113, and the center of the star wheel 11 are on a straight line; each mounting hole 112 Each component is equipped with a clutch fork assembly, with a clearance fit between the clutch fork assembly and the star wheel 11. Each spring hole 113 contains a positioning assembly, consisting of a positioning spring 114 and two positioning pins 115. The top of each positioning pin 115 is conical. The positioning assembly and the star wheel 11 are also clearance fitted. The clutch fork assembly includes a connecting shaft 21, clutch fork I 22, clutch fork II 23, a rotating shaft 24, and a retaining ring 4. Both ends of the connecting shaft 21 are equipped with clutch forks I 22 and II 23, and both clutch forks I 22 and II 23 have U-shaped grooves 222. On the side of the star wheel 11, clutch forks I 22 and II 23, three conical positioning holes 221 are evenly arranged on each of them, with the mounting hole 112 as the center and the distance from the central axis of the mounting hole 112 to the central axis of the spring hole 113 as the radius. The connecting shaft 21, clutch fork I 22, and rotating shaft 24 are integrated on the same part. A D-shaped shaft 211 and a retaining ring groove 212 are provided between the connecting shaft 21 and the rotating shaft 24. Two threads 241 are provided on the rotating shaft 24. A D-shaped hole 231 is provided on the clutch fork II 23, and the clutch fork II 23 is mounted on the D-shaped shaft 21 through the D-shaped hole 231. 1. It is locked with a snap ring 4; the reversing ring 3 is a circular ring, and the central axis of the reversing ring 3 is coaxial with the central axis of the star wheel 11. Twelve reversing holes 31 are evenly arranged on the reversing ring 3. Each reversing hole 31 has a rotating shaft 24 coaxial with it. Each reversing hole 31 is provided with two grooves 32 that cooperate with the two threads 241 on the rotating shaft 24; the roller 5 is locked between the two U-shaped grooves 222 of the clutch fork I and the clutch fork II; the outer ring 12 is located outside the star wheel 11. In this invention, regardless of whether the bidirectional wedge groove is set on the star wheel or the outer ring, the one located on the outside is called the outer ring and the one located on the inside is called the star wheel.

[0025] When the reversing ring is in the middle position of the rotating shaft, the clutch fork I and clutch fork II are in the middle of the bidirectional wedge groove, and the positioning pin 115 is pressed in the middle positioning hole 221. At this time, the roller 5 and the outer ring 12 are separated. When the reversing ring moves closer to (or further away from) the star wheel 11, the groove 32 on the reversing hole 31 pushes the thread 241 to make the rotating shaft 24 rotate clockwise (or counterclockwise). The roller 5 is pushed by the two U-shaped grooves 222 to achieve clockwise (or counterclockwise) engagement with the outer ring, and the positioning pin 115 is pressed in the corresponding positioning hole 221.

[0026] like Figures 9-11 The following is a specific embodiment 2 of the present invention, which provides a bidirectional overrunning clutch. The difference between this embodiment and embodiment 1 is that the bidirectional wedge groove 111, mounting hole 112, and spring hole 113 are provided on the outer ring 12.

[0027] like Figure 12 The illustration shows a specific embodiment 3 of the present invention, which provides a three-speed electric bicycle transmission, comprising an overrunning clutch I, an overrunning clutch II, a planetary gear set I, a planetary gear set II, a planetary carrier 8, and a motor 9; the overrunning clutch I and the overrunning clutch II share an outer ring 12, which is also the wheel hub of the electric bicycle; the inner side of the planetary gears of the overrunning clutch I and the overrunning clutch II are provided with gear rings, which, together with the double gear 91 on the motor 9 and the planetary gear 7 on the planetary carrier 8, respectively form planetary gear set I and planetary gear set II; a guide rail 103 is provided on the planetary carrier 8, and a shift fork connecting rod 104 is built into the guide rail 103. A shift fork 6 and a permanent magnet 101 are respectively provided on the shift fork connecting rod 104, and an electromagnet 102 is provided on one or both sides of the permanent magnet 101; when the various electromagnets 102 are controlled in different ways, the electric bicycle transmission can be controlled to switch between forward 1st gear, forward 2nd gear, and reverse (energy recovery) gear.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A bidirectional overrunning clutch, characterized in that, The system includes a star wheel, a clutch fork assembly, and a reversing ring. The star wheel has evenly distributed bidirectional wedge-shaped grooves. Each bidirectional wedge-shaped groove has a unique corresponding mounting hole, the central axis of which is parallel to the star wheel's central axis. A clutch fork assembly is mounted on each mounting hole, with a clearance fit between the clutch fork assembly and the star wheel. The clutch fork assembly includes a connecting shaft, clutch fork I, clutch fork II, and a rotating shaft. Both ends of the connecting shaft have clutch fork I and clutch fork II, each with a U-shaped groove. One end of the connecting shaft has a rotating shaft, whose central axis is coaxial with the connecting shaft's central axis. The rotating shaft has one or more threads. The reversing ring is a circular ring, its central axis coaxial with the star wheel's central axis. The reversing ring has an equal number of coaxial reversing holes as the rotating shaft, each with a groove. The number of grooves on a single reversing hole is equal to the number of threads on a single rotating shaft. A corresponding rotating shaft passes through each reversing hole, and a corresponding thread passes through the groove of each reversing hole. The reversing ring can move axially on the star wheel.

2. A bidirectional overrunning clutch according to claim 1, characterized in that, A spring hole is provided between the bidirectional wedge groove and the mounting hole of the star wheel. The central axis of the spring hole is parallel to the central axis of the star wheel. A positioning spring is provided in the middle of the spring hole. Positioning pins are provided at both ends of the spring hole. The top of the positioning pins is conical. On the side of the clutch fork assembly, clutch fork I and clutch fork II near the star wheel, three conical positioning holes are evenly provided on a circle with the mounting hole as the center and the distance from the central axis of the mounting hole to the central axis of the spring hole as the radius.

3. A bidirectional overrunning clutch, characterized in that, The system includes an outer ring, a clutch fork assembly, and a reversing ring. The outer ring has evenly distributed bidirectional wedge-shaped grooves, and each bidirectional wedge-shaped groove has a unique corresponding mounting hole. The central axis of the mounting hole is parallel to the central axis of the outer ring. A clutch fork assembly is mounted on the mounting hole, and the clutch fork assembly and the outer ring are clearance-fitted. The clutch fork assembly includes a connecting shaft, clutch fork I, clutch fork II, and a rotating shaft. Both ends of the connecting shaft have clutch fork I and clutch fork II, each with a U-shaped groove. One end of the connecting shaft has a rotating shaft, whose central axis is coaxial with that of the connecting shaft. The rotating shaft has one or more threads. The reversing ring is a circular ring, with its central axis coaxial with that of the outer ring. The reversing ring has an equal number of coaxial reversing holes as the rotating shaft, and each reversing hole has a groove. The number of grooves on a single reversing hole is equal to the number of threads on a single rotating shaft. A corresponding rotating shaft passes through each reversing hole, and a corresponding thread passes through the groove of each reversing hole. The reversing ring can move axially on the outer ring.

4. A bidirectional overrunning clutch according to claim 3, characterized in that, A spring hole is provided between the bidirectional wedge groove and the mounting hole of the outer ring. The central axis of the spring hole is parallel to the central axis of the outer ring. A positioning spring is provided in the middle of the spring hole. Positioning pins are provided at both ends of the spring hole. The top of the positioning pins is conical. On the side of the clutch fork assembly, clutch fork I and clutch fork II near the outer ring, three conical positioning holes are evenly provided on a circle with the mounting hole as the center and the distance from the central axis of the mounting hole to the central axis of the spring hole as the radius.

5. An electric bicycle transmission, characterized in that, Includes the bidirectional overrunning clutch as described in any one of claims 1 to 4.

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