four-paw clutch

Abstract

The utility model provides a kind of four-tooth clutch, including shell, locating plate and planetary gear, locating plate is connected with electric vehicle wheel, planetary gear is equipped with four, the outer periphery of locating plate is evenly equipped with four rotating shafts in circumferential direction, planetary gear is respectively arranged in rotating shaft, and transmission gear ring inside shell is engaged with locating plate and extends out. Locating plate includes cover plate, inner ring and outer ring, outer ring inner wall is spaced apart and is provided with raceway groove in circumferential direction, spring and roller are arranged in raceway groove, and inner ring center is equipped with the spline hole of cooperation and connection with wheel. The utility model is equipped with four planetary gears, so that transmission stress is more uniform, engagement is stable, gear wear is reduced, and the working stability and service life of clutch are improved.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle clutch technology, and in particular to a four-tooth clutch. Background Technology

[0002] As a power unit that directly drives the wheels, the hub motor of an electric vehicle is compact in structure and has high transmission efficiency, and is widely used in two-wheeled or four-wheeled electric vehicles. In order to connect and disconnect the power between different driving states, the hub motor is usually equipped with a clutch structure to switch between motor drive and coasting states.

[0003] In existing technologies, electric vehicle motor reduction clutches typically employ a three-tooth planetary gear structure. This involves three planetary gears evenly distributed on a gear positioning plate, with the gear ring engaging with the motor output shaft to achieve speed reduction. While this structure can transmit power within a limited space, the relatively small number of planetary gears results in a large load on each gear during torque transmission, leading to uneven stress distribution and problems such as gear wear, increased noise, and decreased operational stability. Furthermore, under frequent start-stop and high-torque conditions, localized stress concentration on the gear positioning plate and clutch assembly can shorten the clutch mechanism's lifespan, hindering long-term stable operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a four-tooth clutch to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a four-tooth clutch is proposed, including a housing, a positioning plate and planetary gears. The positioning plate is connected to the electric vehicle wheel. There are four planetary gears. Four rotating shafts are evenly arranged on the outer periphery of the positioning plate along the circumferential direction. The planetary gears are respectively located on the rotating shafts and extend out of the positioning plate to mesh with the transmission gear ring inside the housing.

[0006] Furthermore, the positioning plate includes a cover plate, an inner ring, and an outer ring. The inner wall of the inner ring is disposed on the rear wheel of the electric vehicle, and the outer ring is fitted onto the outer wall of the inner ring. The inner wall of the outer ring is provided with multiple raceway grooves at intervals along the circumferential direction. The raceway grooves have narrow sections, flat sections, and wide sections arranged sequentially along the circumferential direction. Springs and rollers are disposed in the raceway grooves. One end of the spring is fixed in the raceway groove, and the other end is connected to the roller.

[0007] Furthermore, there are four raceway grooves, which are distributed at equal angles along the circumference of the outer ring and are respectively located in the circumferential section between two adjacent rotating shafts.

[0008] Furthermore, the diameter of the planetary gears is smaller than the diameter of the positioning plate.

[0009] Furthermore, there is no contact between the four planetary gears.

[0010] Furthermore, the planetary gears have nylon teeth made of nylon.

[0011] Furthermore, the inner ring center has a spline hole that connects with the wheel.

[0012] The beneficial effects of this utility model are:

[0013] (1) By evenly distributing four planetary gears on the positioning plate, the force on each planetary gear during transmission is more uniform. Compared with the traditional three-tooth structure, the load on a single planetary gear can be effectively reduced, thereby reducing the risk of gear meshing wear.

[0014] (2) The planetary gears of this utility model form a balanced transmission structure with four points evenly distributed, which can reduce vibration and noise during operation and improve the smoothness and stability of clutch engagement.

[0015] (3) The four-tooth arrangement of this utility model increases the torque transmission capability while ensuring a compact structure, so that the clutch can still maintain stable operation under high load and frequent start-stop conditions, and extends the service life of the overall mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the positioning plate structure of this utility model;

[0018] In the diagram, housing 1; transmission gear ring 11;

[0019] Positioning plate 2; Inner ring 21; Spline hole 211; Outer ring 22; Raceway groove 221; Spring 222; Roller 223; Shaft 23;

[0020] Planetary Wheel 3. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] like Figure 1 and Figure 2 As shown, a four-tooth clutch includes a housing 1, a positioning plate 2, and planetary gears 3. The positioning plate 2 is connected to the wheels of an electric vehicle. There are four planetary gears 3. Four rotating shafts 23 are evenly arranged along the circumferential direction on the outer periphery of the positioning plate 2. The planetary gears 3 are respectively located on the rotating shafts 23 and extend out of the positioning plate 2 to mesh with the transmission gear ring 11 inside the housing 1.

[0023] The housing 1 is used to accommodate and support the clutch assembly. It consists of an upper housing, a lower housing, and a middle housing (not shown in the figure). A through hole is provided in the middle, which is connected by a connecting shaft. The inner side of the middle housing is provided with a transmission gear ring 11. The transmission gear ring 11 has an annular structure with its tooth profile facing the positioning plate 2. It is used to mesh with the outer teeth of the planetary gear 3 to realize power transmission.

[0024] The positioning plate includes a cover plate (not shown in the figure), an inner ring 21, and an outer ring 22, which are located in the middle of the cover plate. The inner ring 21 has a spline hole 211 at its center that connects to the wheel. The spline hole 211 meshes with the spline shaft end of the electric vehicle's rear wheel, achieving a coaxial connection between the positioning plate 2 and the wheel through the spline connection. The outer ring 22 is fitted onto the outer wall of the inner ring 21 and fixed to the cover plate with fasteners. The inner wall of the outer ring 22 has multiple raceway grooves 221 spaced along the circumferential direction. Each raceway groove 221 has a narrow section, a flat section, and a wide section arranged sequentially along the circumferential direction. A spring 222 and a roller 223 are installed within each raceway groove 221. One end of the spring 222 is fixed within the raceway groove 221, and the other end is connected to the roller 223. There are four raceway grooves 221, evenly distributed along the circumferential direction of the outer ring 22, respectively located within the circumferential section between two adjacent rotating shafts 23. The arrangement of the raceway groove 221 and the planetary gear 3 is designed to ensure that they do not interfere with each other, thus guaranteeing the installation space for the planetary gears and the complete guide stroke of the raceway groove.

[0025] The diameter of planetary gear 3 is smaller than that of positioning plate 2 to ensure sufficient rotational space for planetary gear 3 during meshing transmission. This ensures that planetary gear 3 maintains a reasonable meshing center distance when meshing with transmission gear ring 11, improving meshing accuracy and transmission smoothness. There is no contact between the four planetary gears 3, allowing each planetary gear to bear force independently during rotation, avoiding interference, meshing noise, and abnormal wear caused by tooth side contact. The planetary gears 3 have nylon teeth made of nylon material, which has good wear resistance, self-lubrication, and vibration damping properties. This allows for smooth meshing without additional lubrication, reducing operating noise. Furthermore, the elastic characteristics of nylon teeth can absorb gear meshing impact to a certain extent, extending the service life of the gears and the overall clutch mechanism.

[0026] Working principle: When in use, the motor output shaft is directly connected to the housing 1, and the positioning plate 2 is installed with the wheel spline shaft end through the spline hole 211 of the inner ring 21, so that the clutch, wheel and motor are arranged coaxially.

[0027] When the motor starts, the motor output shaft drives the housing 1 to rotate, and the transmission gear ring 11 in the middle of the housing rotates accordingly. The gear ring 11 meshes with the external teeth of the four planetary gears 3 to form a reduction transmission mechanism. The planetary gears 3 are supported on the outer periphery of the positioning plate 2 through the rotating shaft 23. During the meshing process, the rotational torque of the gear ring 11 is evenly transmitted to the positioning plate 2, so that the positioning plate 2 rotates synchronously and drives the wheel to rotate, thereby realizing the drive output.

[0028] When the motor drives, the raceway groove 221 on the inner wall of the outer ring 22 drives the roller 223 to slide into the narrow section area. Under the elastic force of the spring 222, the roller 223 is clamped between the outer ring 22 and the inner ring 21, and the inner ring 21 and the outer ring 22 thus form a locked state, and the power can be smoothly transmitted from the motor to the wheel.

[0029] When the motor decelerates or stops, the wheel continues to rotate due to inertia, causing the inner ring 21 to move in the opposite direction to the outer ring 22. At this time, the roller 223, guided by the raceway groove 221, moves from the narrow section to the wide section, releasing the clamping effect on the inner ring 21 and causing the inner ring 21 to disengage from the outer ring 22. The housing 1 and the planetary gear 3 no longer rotate passively, thus allowing the wheel to maintain a free-sliding state.

[0030] In this embodiment, the number of planetary gears 3 is selected as four. Compared with the traditional three-tooth arrangement, four planetary gears can make the force distribution more uniform and significantly reduce the single-tooth load, thereby improving the overall transmission stability and service life. However, if the number of planetary gears is further increased to five or more, it will lead to a more complex positioning plate structure, insufficient installation space, and a smaller center angle between the teeth, increasing the difficulty of processing and assembly, and may affect the clutch response characteristics. Therefore, under the premise of ensuring torque transmission capacity and structural compactness, the arrangement of four planetary gears is the optimal solution that comprehensively considers mechanical strength, assembly space, and transmission balance.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A four-tooth clutch, comprising a housing (1), a positioning plate (2), and planetary gears (3), characterized in that: The positioning plate (2) is connected to the electric vehicle wheel. There are four planetary gears (3). Four rotating shafts (23) are evenly arranged on the outer periphery of the positioning plate (2) along the circumferential direction. The planetary gears (3) are respectively located on the rotating shafts (23) and extend out of the positioning plate (2) to mesh with the transmission gear ring (11) inside the housing (1).

2. The four-tooth clutch according to claim 1, characterized in that: The positioning plate includes a cover plate, an inner ring (21) and an outer ring (22). The inner wall of the inner ring (21) is set on the rear wheel of the electric vehicle, and the outer ring (22) is fitted on the outer wall of the inner ring (21). The inner wall of the outer ring (22) is provided with multiple raceway grooves (221) at intervals along the circumferential direction. The raceway groove (221) has a narrow section, a flat section and a wide section arranged sequentially along the circumferential direction. A spring (222) and a roller (223) are provided in the raceway groove (221). One end of the spring (222) is fixed in the raceway groove (221), and the other end is connected to the roller (223).

3. The four-tooth clutch according to claim 2, characterized in that: There are four raceway grooves (221), which are distributed at equal angles along the circumference of the outer ring (22) and are respectively located in the circumferential section between two adjacent rotating shafts (23).

4. The four-tooth clutch according to claim 1, characterized in that: The diameter of the planetary gear (3) is smaller than the diameter of the positioning plate (2).

5. The four-tooth clutch according to claim 3, characterized in that: There is no contact between the four planetary wheels (3).

6. The four-tooth clutch according to claim 1, characterized in that: The planetary gear (3) has nylon teeth made of nylon.

7. The four-tooth clutch according to claim 2, characterized in that: The inner ring (21) has a spline hole (211) at its center that is connected to the wheel.

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