Coaxial transmission with intermediate roller links

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in drives of high-accuracy machines and mechanisms. Proposed transmission contains high-speed shaft 1 and slow-speed shaft 2, eccentric 3, stationary central wheel 9 with internal shaped profile, holder 7 with radial slots, roller intermediate links 8 placed in slots, cam 4 and additional cam 10. Cam 4 with shaped profile on outer surface is installed on eccentric 3 of high-speed shaft 1 through antifriction bearing and is in mechanical contact with roller intermediate links 8. Additional cam 10 is rigidly coupled with slow-speed shaft 2 and is turned relative to cam 4. Number of lobes of cam 4 is equal to number of lobes of additional cam 10 and differs from number of roller intermediate links 8.

EFFECT: reduced weight, axial dimensions and unbalance of transmission.

2 cl, 2 dwg

 

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.

Known transmission with intermediate units 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 N 2071006, 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 hypochilidae is such surfaces, located on the master and slave drives, with a large number of rolling elements located between the surfaces and transmitting torque between the drive wheel and the follower. Rolling elements made in the form of cylindrical rollers, which when rotated, transmit torque, while remaining 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 an oscillating motion. 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.

However the com of this device is non-axial movement of the output link of a single-stage transmission, why introduce additional wheels with epitrochoidal and hypotrochoidal profiles, which increases the axial dimension of the mechanism. In addition, the input shaft on Cam 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 links. Transfer, as well as in the prototype, contains 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 wheel shaped outer profile (the Cam), roller intermediate links in the ferrule, the Central wheel with internal shaped profile. On the high-speed Cam shaft through the bearing set Cam, which is located in the kinematic contact with the intermediate roller links. The intermediate roller units simultaneously in contact with the inner shaped profile of the Central wheel, Kulick is m, and according to the invention, an additional Cam rigidly mounted on the low speed shaft and is rotated relative to the Cam located on the Cam. And the additional Cam is rotated at 180°, the number of projections additional Cam equally with the number of protrusions of the Cam.

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.

1 shows a coaxial transmission with intermediate links, a longitudinal section; figure 2 is a cross section A-a in figure 1.

Coaxially with the intermediate transfer roller chains (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 Cam 4 is mounted on the Cam 3 through the support 5 has a shaped profile, the number of protrusions is equal to z Rocker 6, mounted on high-speed shaft 1, is used for balancing the masses. In the holder 7 is placed intermediate roller units 8, kinematically connected with a shaped profile fixed Central wheel 9, the Cam 4 and the additional Cam 10 is rotated relative to the Cam 4 180° and rigidly connected to the low-speed shaft 2 mounted in the housing 11 on the supports 12. The quantity ro is ekovich intermediate links 8, the number of protrusions profile fixed Central wheel 9 and the number of protrusions profile additional Cam 10 is different, and if the number of protrusions of the Cam 4 and the additional Cam 10 is the same and equal to Z, the number of roller intermediate links 8 - Z+1, and the number of protrusions profile fixed Central wheel 9 - 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. Thanks to the high-speed shaft 1 eccentricity 3, the Cam 4 receives an oscillating motion, because the intermediate links 8, is placed in the holder 7, getting into the wedge between the Cam profile 4 and profile fixed Central wheel 9, objetivas profile fixed Central wheel 9 and at the same time being in kinematic connection with the profiles of the Cam 4 and the additional Cam 10, cause additional rotation of the Cam 10 due to the difference in the number of the projections of the profile of the Central wheel 9, the number of roller intermediate links 8 and the number of protrusions profile additional Cam 10 per unit. When additional rotation of the Cam 10 is rotated at the low speed shaft 2, since they are tightly linked.

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

1. Coaxially with the intermediate transfer roller chains 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, the Cam shaped profile on the outer surface, mounted on a high-speed Cam shaft through the bearing and located in the kinematic contact with the roller of the intermediate links, additional Cam performed on the outer surface of the shaped profile, wherein the additional Cam rigidly connected with the low speed shaft and rotated relative to the Cam shaped profile on the outer surface, and the number of protrusions of the Cam profile that is installed on the high-speed Cam shaft, the same number of protrusions additional Cam and is different from the number of roller intermediate links.

2. Coaxially with the intermediate transfer roller chains according to claim 1, characterized in that the additional Cam is rotated relative to the Cam located on the high-speed Cam shaft, 180°.



 

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