Novel sliding type gear speed change device

Abstract

A novel sliding type gear speed change device is characterized in that a small wheel assembly and a large gear set are installed on a gear frame in a perpendicular mode, the large gear set is provided with a plurality of concentric gear rings with teeth perpendicular to the direction of the face of the gear set and different in diameter, and the small wheel assembly is composed of a left outer small wheel and a right outer small wheel which can rotate independently. Two rows of magnets with magnetic poles arranged alternately are assembled on the gear plate, the upper sliding plate and the lower sliding plate are assembled in sliding grooves of the gear plate respectively and can slide in the sliding grooves, a U-shaped spring and two bolts are assembled in the lower sliding plate, and the two ends of an opening in the upper portion of the U-shaped spring are assembled in two grooves in the lower portion of the upper sliding plate at the same time. Therefore, elastic linkage of the lower sliding plate driven by the upper sliding plate is achieved. The device is simple in structure and low in manufacturing cost, and can be widely applied to occasions needing low-cost and small-sized mechanical speed change, such as bicycles and small-sized electric automobiles.

Description

Technical Field

[0001] This utility model relates to a novel sliding gear transmission device. The device employs two sets of gears, one large and one small, arranged vertically. Gear shifting is achieved by the small gear set sliding on the large gear set. The device has a simple structure and low manufacturing cost, and can be widely used in applications requiring low-cost, miniaturized mechanical gear shifting, such as bicycles and small electric vehicles. This utility model relates to the technical fields of engineering mechanics and mechanical design. Background Technology

[0002] Gearboxes are a widely used type of mechanical device, but traditional mechanical devices, such as car gearboxes or bicycle gear shifters, have complex structures, leading to high manufacturing costs and difficult maintenance. Furthermore, to reduce complexity, many simplified gearboxes have emerged on the market, but the smoothness of the shifting process has become a major problem. To address this issue, many continuously variable transmission (CVT) solutions have been developed. However, most current CVT solutions are based on friction drives (such as belts), which suffer from high energy loss and low torque transmission capacity. Summary of the Invention

[0003] To overcome the aforementioned shortcomings of existing gear shifting devices, this invention employs two sets of gears, one large and one small, arranged vertically. Gear shifting is achieved by the small gear set sliding on the large gear set. The device has a simple structure and low manufacturing cost, and can be widely used in bicycles, small electric vehicles, and other applications requiring low-cost, miniaturized mechanical gear shifting. The specific technical solution is described below.

[0004] The technical solution of this utility model is as follows: a novel sliding gear transmission device, characterized in that the small gear assembly and the large gear set 22 are mounted vertically on the gear carrier 11. The large gear set 22 has multiple sets of concentric gear rings with teeth perpendicular to the gear set surface but with different diameters. The small gear assembly consists of two independently rotatable parts: a left outer small gear 2 and a right outer small gear 5. The right outer small gear 5 forms a unidirectional rotating ratchet device through a stop slider 3 and a spring 4 mounted on the right inner sleeve 7. A set of magnets is respectively installed in two opposite concave holes in the left outer small gear 2. This set of magnets attracts the middle set of magnets mounted in the left inner sleeve 8, while the other sets of magnets repel each other, achieving the reset effect after the left outer small gear 2 is forced to rotate. Preferably, a stop plate 1 is mounted on the gear carrier 11. 5. Two rows of magnets with alternating magnetic poles are mounted on the gear plate 15. The upper slide plate 16 and the lower slide plate 18 are respectively mounted in the slide groove of the gear plate 15 and can slide in the slide groove. The lower slide plate 18 is equipped with a U-shaped spring 17 and two bolts 19. The two ends of the upper opening of the U-shaped spring 17 are simultaneously mounted in the two grooves at the bottom of the upper slide plate 16, thereby realizing the elastic linkage of the lower slide plate 18 driven by the upper slide plate 16. The lower part of the upper slide plate 16 is also equipped with a set of magnets. When the set of magnets slides with the upper slide plate 16, it sequentially generates attraction and repulsion with the two rows of magnets mounted on the gear plate 15. At the same time, the lower part of the lower slide plate 18 and the lower slide plate B part 20 are mounted on the bearing A9, thereby pushing the small wheel assembly to slide between the concentric gear rings on the disk of the large gear set 22 to realize the gear switching.

[0005] The beneficial effects of this utility model are: the device has a simple structure and low manufacturing cost, and can be widely used in bicycles, small electric vehicles and other occasions that require low-cost, miniaturized mechanical gear shifting. Attached Figure Description

[0006] The present invention will be further described below with reference to the accompanying drawings and examples.

[0007] Figure 1 Schematic diagram of the right inner sleeve structure

[0008] Figure 2 Schematic diagram of the right outer small wheel structure

[0009] Figure 3 Left inner sleeve structure diagram

[0010] Figure 4 Left outer small wheel structure diagram

[0011] Figure 5 Exploded view of the wheel assembly

[0012] Figure 6 Right-side view of the assembled small wheel assembly

[0013] Figure 7Schematic diagram of the internal structure of the small wheel assembly with the right outer cover removed.

[0014] Figure 8 Left-side view of the assembled small wheel assembly

[0015] Figure 9 Schematic diagram of the internal structure of the small wheel assembly with the left outer cover removed.

[0016] Figure 10 Internal working principle diagram of the small wheel assembly on the left side

[0017] Figure 11 Assembly diagram of the small wheel assembly, bearing, and limit nut

[0018] Figure 12 Image showing the effect after the small wheel assembly is assembled with bearings and limit nuts.

[0019] Figure 13 Schematic diagram of gear carrier structure

[0020] Figure 14 Assembly diagram of the small wheel assembly, gear carrier, and other auxiliary parts.

[0021] Figure 15 Rendering of the small wheel assembly mounted on the gear carrier.

[0022] Figure 16 Schematic diagram of the lower part of the upper slide plate

[0023] Figure 17 Schematic diagram of the upper structure of the slide plate

[0024] Figure 18 Schematic diagram of the lower part of the sliding plate

[0025] Figure 19 schematic diagram of the upper structure of the slide plate

[0026] Figure 20 Cross-sectional view of the internal structure of the slide plate

[0027] Figure 21 Schematic diagram of the baffle plate structure

[0028] Figure 22 Assembly diagram of the upper and lower sliding plates and other auxiliary parts on the stop plate.

[0029] Figure 23 Assembly direction diagram of the upper and lower sliding plates in the gear plate groove

[0030] Figure 24 Internal cross-sectional view of the linkage between the upper and lower sliding plates

[0031] Figure 25 Image showing the effect of the upper and lower sliding plates after being assembled on the gear shift plate.

[0032] Figure 26 Assembly diagram of the gear shift assembly on the gear carrier

[0033] Figure 27 Image showing the gear shift assembly assembled on the gear carrier.

[0034] Figure 28 Assembly diagram of sliding rod sleeve and lower slide plate B on the gear shift assembly

[0035] Figure 29 The image shows the effect of the sliding rod sleeve and the lower slide plate B being assembled on the gear shift assembly.

[0036] Figure 30 Assembly diagram of the large gear set and bearings on the gear carrier

[0037] Figure 31 Rendering of the large gear set and bearings assembled on the gear carrier.

[0038] in, Figure 5 1. Left outer cover, 2. Left outer small wheel, 3. Stop slider, 4. Spring, 5. Right outer small wheel, 6. Right outer cover, 7. Right inner sleeve, 8. Left inner sleeve; Figure 11 9. Bearing A, 10. Limiting nut; Figure 14 11. Gear carrier, 12. Bearing B, 13. Connecting sleeve, 14. Hexagonal bar; Figure 22 15. Stop plate, 16. Upper sliding plate, 17. U-shaped spring, 18. Lower sliding plate, 19. Bolt; Figure 28 20. Lower slide plate (part B); 21. Sliding rod sleeve; Figure 30 22. Large gear set, 23. Bearing C Detailed Implementation

[0039] Assembly process: First, follow Figure 5 Assemble the left outer cover 1, left outer small wheel 2, stop slider 3, spring 4, right outer small wheel 5, right outer cover 6, right inner sleeve 7, and left inner sleeve 8 together to form the small wheel assembly. The right inner sleeve 7 and left inner sleeve 8 are connected back-to-back by welding or bonding. Then, according to... Figure 11 Assemble bearing A9 and limit nut 10 onto the small wheel assembly. Then, assemble the above-mentioned components according to... Figure 14 The components, including two bearings B12, two connecting sleeves 13, and a hexagonal rod 14, are assembled onto the gear carrier 11 in the following manner. Figure 22 The upper slide plate 16 (with a set of magnets pre-assembled at the bottom), U-shaped spring 17, lower slide plate 18, and bolts 19 are assembled into the stop plate 15 (with two rows of alternating magnetic poles pre-assembled on the stop plate 15) to form the stop assembly. Then, according to... Figure 28The sliding rod sleeve 21 and the lower slide plate B part 20 are installed on the gear assembly in the following manner. Finally, they are installed according to... Figure 30 The assembly is complete once the large gear set 22 and bearing C23 are installed in this manner.

[0040] Working principle: Inputting power from the hexagonal bar 14 enables speed change from high to low speed, while inputting power from the large gear set 22 enables speed change from low to high speed. Taking the more common high-speed to low-speed change as an example, when the hexagonal bar 14 rotates under the drive of an external force, it actuates the upper part of the sliding rod sleeve 21. The upper slide plate 16 then pushes the lower slide plate 18 together with the U-shaped spring 17 to slide in the groove of the stop plate 15. Since the lower part of the lower slide plate 18 and the lower slide plate B part 20 are assembled to the bearing A9, the entire small wheel assembly will slide simultaneously on the hexagonal bar 14, thereby pushing the left outer small wheel 2 and the right outer small wheel 5 to engage and disengage between the two adjacent inner and outer gear rings of the large gear set 22, thus realizing the speed change of the device. When no external force is applied to the upper part of the sliding sleeve 21, the small wheel assembly will be limited to a certain fixed position by the force of the magnet on the stop plate 15 and the magnet at the lower part of the upper slide plate 16. At this time, only one of the left outer small wheel 2 and the right outer small wheel 5 is engaged with a certain gear ring on the large gear set 22. During the process of pushing the sliding sleeve 21 to realize gear switching, at a certain moment, the phenomenon occurs where the left outer small wheel 2 and the right outer small wheel 5 are simultaneously engaged with two adjacent gear rings on the large gear set 22. Since the outer gear ring has more teeth, the speed of the right outer small wheel 5 is higher than that of the left outer small wheel 2. At this time, the one-way ratchet device composed of the right outer small wheel 5, the stop slider 3 on the right inner sleeve 7 and the spring 4 begins to work, and the right outer small wheel 5 rotates unidirectionally relative to the left outer small wheel 2. If the small gear assembly moves towards the outer edge of the large gear set 22 at the next moment, the left outer small gear 2 will disengage from the inner gear ring of the large gear set 22, achieving a downshift. If the small gear assembly moves towards the center of the large gear set 22 at the next moment, the right outer small gear 5 will disengage from the outer gear ring of the large gear set 22, achieving an upshift. It should also be noted that the small gear assembly uses a design with two independently rotating parts: the left outer small gear 2 and the right outer small gear 5. One reason for this is to ensure smooth shifting. Although both outer small gears can rotate, their relative rotational speeds are not large, avoiding the "neutral" period common in traditional gear shifting devices. This ensures that the speed difference between the outer small gear about to engage and the upper gear ring of the large gear set 22 will not be too large, thus guaranteeing a smooth shifting process. Furthermore, the ratchet design of the right outer pinion 5 and the reset design of the left outer pinion 2, which attracts the middle set of magnets assembled in the left inner sleeve 8 while repelling the other sets of magnets, are designed to ensure smooth movement of the pinion assembly as a whole on the same gear ring of the large gear set 22. This also ensures the smoothness of the shifting process of this device to a certain extent. Finally, the U-shaped spring 17 is used to achieve the elastic linkage between the lower slide plate 18 and the upper slide plate 16, which can realize the design intention of "shifting first and then engaging". That is, the lower magnet of the upper slide plate 16 and the corresponding magnet on the gear plate 15 determine the gear position of the upper slide plate 16 on the gear plate 15, and then the elastic action of the U-shaped spring 17 pushes the pinion assembly to achieve shifting. This also ensures the smoothness of the shifting process of this device from another perspective.

Claims

1. A novel sliding gear shift device characterized in that The small wheel assembly and the large gear group (22) are installed vertically on the gear frame (11), the large gear group (22) has multiple sets of teeth vertically arranged on the surface of the gear group (22), the small wheel assembly is composed of two independently rotatable left outer small wheels (2) and right outer small wheels (5), the right outer small wheels (5) are assembled with the stopper sliding block (3) and the spring (4) on the right inner sleeve (7) to form a one-way rotating ratchet device, two opposite recesses in the left outer small wheels (2) are respectively assembled with a set of magnets, the set of magnets is attracted to the intermediate set of magnets assembled in the left inner sleeve (8), and the remaining set of magnets is repelled, so that the left outer small wheels (2) are forced to rotate and reset.

2. The new sliding gear shift device according to claim 1, characterized in that The gear frame (11) is assembled with the gear plate (15), the gear plate (15) is assembled with two rows of magnet poles alternately arranged, the upper sliding plate (16) and the lower sliding plate (18) are respectively assembled into the sliding groove of the gear plate (15) and can slide in the sliding groove, the lower sliding plate (18) is assembled with the U-shaped spring (17) and two bolts (19), the two ends of the opening at the upper part of the U-shaped spring (17) are simultaneously assembled into the two recesses at the lower part of the upper sliding plate (16), so that the lower sliding plate (18) is elastically connected under the driving of the upper sliding plate (16), the lower part of the upper sliding plate (16) is also assembled with a set of magnets, the set of magnets sequentially generates attraction and repulsion with the two rows of magnets assembled on the gear plate (15) when sliding with the upper sliding plate (16), at the same time, the lower part of the lower sliding plate (18) and the lower sliding plate B (20) are assembled into the bearing A (9), so as to push the small wheel assembly to slide between the concentric gear rings on the surface of the large gear group (22), and the gear shifting is realized.

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