Radial drive planet wheel transmission mechanism

Abstract

The invention 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 invention 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 present invention belongs to the field of mechanical transmission technology, especially to decentralized center wheel, in which input and output are completed by a rotating arm, and the planetary gear adopts a differential diameter structure as the leading component to transmit torque, and drives the output roller and the output shaft connected thereto in rolling during revolution, thus forming a radially driven planetary gear transmission mechanism with new technology, low cost and greatly improved transmission efficiency.

[0002] Background technology: At present, the known planetary gear transmission mechanism is composed of a central gear (sun gear), planetary gears, and a planetary carrier (rotating arm). The planetary gear is a transitional gear that only serves to change the transmission ratio, reversing transmission, etc. It has a complex structure, outdated technology, and high cost. In particular, it cannot improve the transmission efficiency, and the teeth cannot achieve complete rolling friction transmission, and cannot reduce the friction resistance generated by sliding transmission.

[0003] Invention content: In order to change the current technical situation, the present invention adopts decentralized center gear, the input shaft is directly connected to the planetary frame to drive the planetary gear and the coaxial auxiliary gear, and the structure is simple; the planetary gear adopts a differential diameter structure as the leading transmission component; the planetary gear meshes with the fixed axis sun gear, and the auxiliary gear rolls to drive the output roller, and the roller is installed on the rotating arm connected to the output shaft. This structure forms the axis of the planetary gear as the main force point, the meshing point of the planetary gear and the fixed axis gear ring is the instantaneous fulcrum, the radius is the active torque, and the distance from the coaxial auxiliary gear to the instantaneous fulcrum is the passive torque. This mechanical mechanism is copied to the planetary gear to realize the transmission mechanism with large input torque, small output torque, and instantaneous fulcrum, and the overall synchronous movement with the planetary gear revolution. Obviously, after the simple torque principle is copied to the planetary gear, the input gear train adopts a large force arm, the output gear train adopts a small force arm, and the fulcrum becomes an instantaneous fulcrum, realizing torque transmission, and greatly improving the transmission efficiency; at the same time, the coaxial auxiliary gear and the output roller adopt pure rolling friction transmission, which further reduces the friction resistance generated by gear sliding.

[0004] The technical solution adopted by the present invention to solve the technical problem is: it includes an input rotating arm connected to the input shaft in the input gear system, a planetary wheel and a planetary wheel auxiliary wheel, and a fixed-axis gear ring, wherein the planetary wheel auxiliary wheel is coaxial with the planetary wheel, the input rotating arm drives the planetary wheel, and the planetary wheel 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 wheel auxiliary wheel, the distance from the contact point to the meshing point of the planetary wheel and the fixed-axis gear ring is smaller than the radius of the planetary wheel, and the roller is installed on the output rotating arm. In this way, the axis of the planetary wheel is used as the point of action of the main force, the meshing point between the planetary wheel and the fixed-axis gear ring is the instantaneous fulcrum, the distance from the axis to the instantaneous fulcrum, that is, the radius of the planetary wheel is the main power arm (not the aforementioned input swing arm), and the distance from the contact point between the planetary wheel auxiliary wheel and the roller to the instantaneous fulcrum is the passive power arm (not the aforementioned output swing arm). The planetary wheel, as a deformed lever, forms an integral lever principle mechanism, and this mechanism is copied to the plane of the planetary wheel with the fulcrum constantly moving. Regardless of the size of the force arm and the instantaneous fulcrum, they all move as a whole with the planetary wheel revolution. The technical definition is that the input force arm is large and the output force arm is small, thereby achieving a significant improvement in transmission efficiency. In addition, the center wheel is removed, the planetary wheel is used as the leading transmission component, and the swing arm is used as the input and output, which further reduces the transmission components; and the rolling friction transmission is used in the output gear system to overcome the gear meshing sliding friction transmission factor and further reduce the sliding friction resistance.

[0005] The beneficial effects of the present invention are as follows: Based on the above technical scheme, 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 wheel is given a new function of transmitting kinetic energy, so that the planetary wheel idler is not idle, and the input and output are completed by the rotating arm, which has a simple structure; second, the planetary wheel 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 wheel transmission mechanism. Regardless of the size of the force arm, it moves simultaneously in the plane, which significantly improves the transmission efficiency; third, the rolling friction transmission between the planetary wheel pair and the roller further reduces the sliding friction transmission resistance. In short, the radial-driven planetary wheel transmission mechanism adopts decentralized center wheel, differential diameter structure, and rolling friction transmission, which realizes new process, low cost, and greatly improves the transmission efficiency, and achieves the purpose of the invention. This is a basic technology and key component of the manufacturing industry, which can be widely used in the field of equipment manufacturing.

[0006] BRIEF DESCRIPTION OF THE DRAWINGS: The present invention will be further described below with reference to the accompanying drawings.

[0007] Figure 1 It is the front view of the present invention. Figure 2 It is a side view of the present invention.

[0008] Figure 1 Among them, 1. input swing arm, 2. planetary gear, 3. planetary gear pair, 4. fixed axis gear ring, 5. roller, 6. output swing 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) meshes with the fixed axis gear ring (4); when revolving, the planetary gear pair (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 between 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 active force arm. The distance from the contact point between the planetary gear pair (3) and the roller (5) to the instantaneous fulcrum is the passive force arm. It should be noted that the passive force arm is smaller than the active force 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 active force arm or the small passive force 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 central gear (sun gear), saving the central gear, making the entire transmission mechanism simple, 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 set to reduce the friction transmission resistance.

[0011] As is known to all, the motion trajectory of each point of the planetary wheel pair (3) coaxial with the planetary wheel (2) is a cycloid and a more complex plane curve. Therefore, the selection of the contact point between the planetary wheel pair (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 radially driven planetary gear transmission mechanism, there are more than two planetary gears (2) and coaxial planetary gear pairs (3), and the number of input rotating arms (1), output rotating arms (6) and rollers (5) is the same as that of 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, and the input rotating arm (1) rotates one circle, and the output rotating arm (6) also rotates one circle. The transmission ratio is 1:1, and the calculation formula does not need to be repeated. 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. A radially driven planetary gear transmission mechanism, comprising an input rotating arm (1), a planetary gear (2), a planetary gear pair (3), 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 pair (3) and the planetary gear (2) roll and drive the roller (5), and the roller (5) is mounted on the output rotating arm (6).

2. According to claim 1, the planetary gear set (3) is coaxial with the planetary gear (2), the contact point between the planetary gear set (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 less than the radius of the planetary gear (2).

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