Coaxial transmission with intermediate links

 

The invention relates to precise engineering, namely gears for messages rotational motion, and can be used in the actuators to reduce the output shaft speed precision machines and mechanisms. The transmission contains a high-speed 1 and speed 2 shaft, a stationary Central wheel 8, the Cam 9 and yoke roller intermediate links 6. On high-speed shaft 1 is mounted a Cam 3. On Cam 3 has a bearing 4. The shaped profile of the Cam 9 is made in the form of the outer ring gear. Intermediates 6 simultaneously in contact with the inner shaped profile of the Central wheel 8, a bearing outer ring 4 and the outer crown of the Cam 9, rigidly mounted on the low speed shaft 2. The number of teeth of the outer crown of the Cam 9 is different from the number of intermediate links 6. The technical result - the reduction of the eccentricity of the transfer, the mass of the balancer and the axial size of the transmission. 2 Il.

The invention relates to precise engineering, namely gears for messages rotational motion, and can be used in actuators, reduce and, containing coaxial high-speed and low-speed shafts, Cam with shaped groove around the perimeter, mounted on high-speed shaft, a stationary Central wheel with internal teeth, crowns, intermediate links posted in the radial grooves of the holder and moving their ends by braces Cam groove, the second end have a tooth, and Cam, intermediaries and the Central wheel are coaxial (RF patent N2071006, IPC: F 16 N 25/08, 1/00).

A disadvantage of this device are large energy losses due to friction of the intermediate links in the radial slots of the cage and the ring gear when the reciprocating motion of the intermediate links, which are unavoidable during the transmission of large torque, which reduces the efficiency and life of the transmission due to early wear of the intermediate links and the radial grooves of the holder.

As a prototype of the selected epicycle gear, having svobodnayarussia roller drive elements, including a pair of conjugate epicycle and gepaticeski surfaces located on the master and slave drives, with a large number of rolling elements located between the surfaces and transmitting torque from the host the first time, staying in continuous contact with the opposite trochoidal surface. Hypotrochoidal and epitrochoidal surfaces have many Cams, and the number of hypotrochoidal Cams two more numbers epitrochoidal Cams. The number of rollers on one greater than the number epitrochoidal Cams (U.S. patent No. 4584904, IPC: F 16 N 1/28).

The transfer works as follows.

In the process, the high-speed shaft with eccentric rotates with an operating frequency of the motor. On Cam is a wheel with epitrochoidal profile, which during operation receives acceleromete movement. Intermediate rolling elements in the cage, into the wedge between epitrochoidal profile wheels and hypotrochoidal profile fixed Central wheel. Objetivas profile fixed Central wheel, they cause the turning of the wheel with epitrochoidal profile, due to differences in the number of Cam profiles. The rotational output movement of the wheel with epitrochoidal profile obtained planetary.

A disadvantage of this device is non-axial movement of the output link of a single-stage transmission, which introduces additional wheels with epitrochoidal and boom are part of a large mass (Cam with two epitrochoidal profiles, bearings and eccentric), making a significant imbalance in the operation of the mechanism. This imbalance is corrected input into the design of dynamic balancers, which should have significant weight and can additionally increase the axial size of the mechanism.

The task is to reduce the imbalance of the transmission weight and the axial dimension of the mechanism.

This problem is solved thanks to a coaxial transmission with intermediate units containing coaxial high-speed and low-speed shafts. On high-speed shaft is made eccentric, offset from the Central axis by the amount that is On the Cam installed antifriction bearing located in the kinematic contact with the intermediate links. The intermediate links in the cage, at the same time in contact with the inner shaped profile of the Central wheel, a bearing outer ring, located on the high-speed Cam shaft, and an outer shaped profile of the wheel (the Cam). The Cam, in turn, rigidly mounted on the low speed shaft.

With this layout it is possible to reduce the eccentricity twice and, thereby, to reduce the weight of the balancer and to reduce the axial size of the mechanism.

In Fig.1 shows a coaxial perduta with intermediate links (Fig.1, 2) contains a coaxial high-speed 1 and speed 2 shafts, and high-speed shaft 1 is made with a Cam 3, offset from the Central axis of the transmission on the value of e, the rolling bearing 4 mounted on the Cam 3 high-speed shaft 1, the balancer 5, mounted on the high-speed shaft 1, the intermediate roller units 6, is placed in the holder 7, the Central core of the wheel 8, the Cam 9, rigidly connected to the low-speed shaft 2, mounted on the supports 10 in the housing 11. In addition, if the number of projections shaped profile of the Cam 9 is equal to Z, then the number of intermediate roller units 6 is equal to Z+1 and the number of protrusions shaped profile of the Central wheel 8 is equal to Z+2.

The transfer works as follows.

In the process, the high-speed shaft 1 with a Cam 3 rotates at an operating frequency of the motor. Due to the eccentric 3, creating incoming wave, roller intermediate links 6 are in the wedge between the profile of the Central wheel 8 and the outer ring of the bearing 4 mounted on Cam 3 high-speed shaft 1. Roller intermediate links 6 in the holder 7, trying to leave the wedge, obkatyvalisj profile fixed Central wheel 8 and od is no rotational movement on the low speed shaft 2 by means of a rigid connection with him.

Thus, the proposed solution allows to reduce the eccentricity of the transmission twice and the mass of the balancer and the axial overall size compared to the prototype.

Claims

Coaxial transmission with intermediate units containing coaxial high-speed and low-speed shaft and high speed shaft is made with a Cam offset from the Central axis by the value of e, the stationary Central wheel with shaped inner profile yoke with radial grooves in which is placed a roller intermediate links, the number of which differs from the tabs of the profile of the Central wheel, a rolling bearing mounted on the high-speed Cam shaft and located in the kinematic contact with the intermediate roller chains, Cam, performed on the outer surface of the shaped profile, wherein the Cam is rigidly connected with the low speed shaft, the shaped profile of the Cam is made in the form of an external gear number of teeth different from the number of intermediate links of the cage.



 

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