Radial drive planet wheel transmission mechanism

Abstract

The utility model discloses a radial drive planet wheel transmission mechanism which is decentered, completes input and output by a rotating arm, adopts a planet wheel differential diameter structure and is driven in a rolling manner, and belongs to the technical field of mechanical transmission. The problems that in the prior art, only a center wheel can serve as an input and output leading transmission component, a planet wheel is only a transition wheel, the structure is complex, and the transmission efficiency is low are solved. The radial drive star wheel transmission mechanism adopts a decentered wheel and is simple in structure; due to the differential diameter structure, the input torque is increased, and the transmission efficiency is obviously improved; and the rolling driving form further reduces the sliding friction resistance. The utility model aims of novel process, low cost and obvious improvement of transmission efficiency are achieved, and the transmission device is a basic technology and a key part in the manufacturing industry and can be widely applied to the fields of transportation, national defense and military industry, aerospace, ships, metallurgical mines, medical instruments, robots and the like.

Description

[0001] Technical field: The utility model belongs to the field of mechanical transmission technology, especially decentralized center wheel, input and output are completed by the rotating arm, the planetary gear adopts the differential diameter structure as the leading component to transmit torque, and the output roller and the output shaft connected to it are driven by rolling during revolution. It is a radially driven planetary gear transmission mechanism with new technology, low cost and greatly improved transmission efficiency.

[0002] Background: Currently, conventional planetary gear transmissions consist of a sun gear (sun gear), planetary gears, and a planetary carrier (rotating arm). The planetary gears are transitional gears, serving only to change transmission ratios and reverse direction. They are complex, outdated, and expensive. Furthermore, they fail to improve transmission efficiency, and their teeth cannot achieve complete rolling friction, which in turn fails to reduce the frictional resistance generated by sliding transmissions.

[0003] Invention Summary: To improve the current state of technology, the present invention utilizes a decentralized gear system. The input shaft directly connects to the planetary carrier to drive the planetary gears and coaxial pinion gears, resulting in a simple structure. The planetary gears utilize a differential diameter structure as the primary transmission component. The planetary gears mesh with the fixed-axis sun gear, and the pinion gears roll to drive the output roller, which is mounted on a rotating arm connected to the output shaft. This structure creates a planetary gear axis as the active force application point, with the meshing point between the planetary gears and the fixed-axis ring gear serving as the instantaneous fulcrum. The radius represents the active torque, and the distance from the coaxial pinion gear to the instantaneous fulcrum represents the passive torque. By replicating this mechanical mechanism on the planetary gears, a transmission mechanism with high input torque, low output torque, and an instantaneous fulcrum is achieved, resulting in overall synchronous motion with the planetary gears' orbital rotation. Clearly, after replicating this simple torque principle on the planetary gears, the input gear train utilizes a large force arm, while the output gear train utilizes a small force arm, making the fulcrum a transient fulcrum, achieving variable torque transmission and significantly improving transmission efficiency. Simultaneously, the coaxial pinion gears and the output rollers utilize pure rolling friction transmission, further reducing the frictional resistance generated by gear sliding.

[0004] The technical solution adopted by the utility model to solve the technical problem is: it includes an input rotating arm connected to the input shaft in the input gear system, a planetary gear and a planetary gear pair, and a fixed-axis gear ring, wherein the planetary gear pair is coaxial with the planetary gear, the input rotating arm drives the planetary gear, and the planetary gear is meshed with the fixed-axis gear ring; the output gear system includes a roller and an output rotating arm connected to the output shaft, wherein the roller is driven by the planetary gear pair, the distance from the contact point to the meshing point of the planetary gear and the fixed-axis gear ring is smaller than the radius of the planetary gear, and the roller is installed on the output rotating arm. In this way, the planetary gear axis serves as the point of action of the main force, the meshing point between the planetary gear and the fixed-axis gear ring serves as the instantaneous fulcrum, the distance from the axis to the instantaneous fulcrum, that is, the planetary gear radius, serves as the main power arm (not the aforementioned input rotating arm), and the distance from the contact point between the planetary gear pair and the roller to the instantaneous fulcrum serves as the passive power arm (not the aforementioned output rotating arm). The planetary gear, as a deformed lever, forms an integral lever principle mechanism, and this mechanism is replicated on the planetary gear plane with the fulcrum constantly moving. Regardless of the size of the lever arm and the instantaneous fulcrum, the entire mechanism moves as the planetary gear revolves. The technical definition is that the input lever arm is large and the output lever arm is small, thereby achieving a significant improvement in transmission efficiency. In addition, by removing the center gear, the planetary gear serves as the dominant transmission component, and the rotating arm is used as the input and output, further reducing the number of transmission components; and the output gear train adopts rolling friction transmission, which overcomes the gear meshing sliding friction transmission factor and further reduces the sliding friction resistance.

[0005] The beneficial effects of the present invention are as follows: Based on the above technical solution, the embodiments of the present invention produce the following technical effects, which are the original innovative points of the technology: First, the center wheel is decentralized, the input center wheel (sun wheel) is removed, the structure is simple, and the planetary gear is given a new function of transmitting kinetic energy, so that the planetary idler wheel is not idle, and the input and output are completed by the rotating arm, which has a simple structure; second, the planetary gear adopts a differential diameter structure, the active force arm is larger than the passive force arm, and the simple lever principle is copied to the planetary gear transmission mechanism. Regardless of the size of the force arm, it moves simultaneously in the plane, which significantly improves the transmission efficiency; third, the planetary gear pair and the roller are driven by rolling friction, which further reduces the sliding friction transmission resistance. In short, the radial drive planetary gear transmission mechanism adopts decentralized center wheel, differential diameter structure, and rolling friction transmission to achieve new technology, low cost, and greatly improved transmission efficiency, thus achieving the purpose of the invention. This is a basic technology and key component in the manufacturing industry, and can be widely used in the equipment manufacturing industry.

[0006] Description of the drawings: The present invention will be further described below with reference to the accompanying drawings.

[0007] Figure 1 It is the main view of the present utility model. Figure 2 It is a side view of the present utility model.

[0008] Figure 1Among them, 1. Input arm, 2. Planetary gear, 3. Planetary gear pair, 4. Fixed axis ring gear, 5. Roller, 6. Output arm.

[0009] Figure 2 The icons and icon numbers in Figure 1 same.

[0010] Specific implementation method: Figure 1 In the embodiment shown, when the working force drives the input rotating arm (1) and the planetary gear (2) to move in the direction of the working force, the planetary gear (2) engages with the fixed axis gear ring (4); during the revolution, the planetary gear set (3) drives the roller (5) and the output rotating arm (6) to form a radially driven planetary gear transmission mechanism consistent with the torque principle. The meshing point of the planetary gear (2) and the fixed axis gear ring (4) is the instantaneous fulcrum. The distance from the instantaneous fulcrum to the axis of the planetary gear (2), that is, the radius of the planetary gear (2), is the main power arm. The distance from the contact point between the planetary gear pair (3) and the roller (5) to the instantaneous fulcrum is the passive power arm. It should be pointed out that the passive power arm is smaller than the main power arm. This is a key point. Since the fulcrum is instantaneous, the entire radial drive planetary gear transmission mechanism moves with the revolution of the planetary gear (2). In this way, no matter the large main power arm or the small passive power arm, they all move as a whole on the plane of the planetary gear (2) at the same time, saving input force and significantly improving transmission efficiency. In addition, the output adopts the form of a rotating arm instead of the center wheel (sun wheel), saving the center wheel, simplifying the entire transmission mechanism, and further optimizing conventional parameters such as vibration and service life. In addition, the rolling friction transmission form adopted by the planetary gear pair (3) and the roller (5) further reduces the friction resistance of the sliding transmission. The roller (5) has no actual torque physical meaning and is only provided to reduce the friction transmission resistance.

[0011] As is known to all, the motion trajectory of each point of the planetary wheel set (3) coaxial with the planetary wheel (2) is a cycloid or a more complex plane curve. Therefore, the selection of the contact point between the planetary wheel set (3) and the roller (5) must be consistent with the direction of the input force and the distance to the instantaneous fulcrum (passive force arm) must be smaller than the radius of the planetary wheel (2) (active force arm). In this way, regardless of the size of the force arm, the instantaneous fulcrum moves simultaneously on the revolution plane of the planetary wheel (2). This rotation structure determines a significant improvement in transmission efficiency.

[0012] In order to ensure the smooth movement of the entire radial drive planetary gear transmission mechanism, there are more than two planetary gears (2) and the coaxial planetary gear pairs (3), and the input rotating arm (1), the output rotating arm (6) and the roller (5) are the same number as the planetary gears (2) and the planetary gear pairs (3) (not indicated in the attached drawings). In addition, the transmission ratio is defined according to the number of teeth of the input and output wheels. In the present invention, the input rotating arm (1) drives the planetary gear (2) to revolve. When the input rotating arm (1) rotates one circle, the output rotating arm (6) also rotates one circle. The transmission ratio is 1:1. There is no need to elaborate on the calculation formula. However, when other mechanisms are added to the output rotating arm (6) as the terminal output, the transmission ratio will also change accordingly.

Claims

1. Radial drive planetary gear transmission mechanism, characterized by: The invention comprises an input rotating arm (1), a planetary gear (2), a planetary gear pair (3), and a fixed-axis gear ring (4) in an input gear train, and a roller (5) and an output rotating arm (6) in an output gear train, wherein the planetary gear (2) is meshed with the fixed-axis gear ring (4), the planetary gear (2) and the planetary gear pair (3) are coaxially connected, and the planetary gear pair (3) rollingly drives the roller (5) mounted on the output rotating arm (6).

2. The radial-driven planetary gear transmission mechanism according to claim 1, wherein: The contact point between the planetary gear pair (3) and the roller (5) is in the direction of revolution of the planetary gear (2), and the distance to the meshing point between the planetary gear (2) and the fixed axis gear ring (4) is smaller than the radius of the planetary gear (2).

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