| The cycloid-pin transmission is mostly used in general transmission and high precision transmission.By combining modification of cycloid wheels,different modified profiles are applied to different transmission conditions.However,there is no cycloidal tooth profile that can guarantee high carrying capacity and high transmission accuracy at the same time.FT transmission system is a new cycloid-pin tansmission system after FA and RV cycloid-pin drive.Compared with traditional cycloid-pin transmission,it features with compact structure,high transmission accuracy,great transmission efficiency and smooth transmission.Therefore,it is mainly used in robot and it has been widely used in many high-precision transmission structure fields.In this paper,takes the FT455 as the carrier of cycloid gear stress balanced modification.The stress balanced modification method means that on the basis of guaranteeing the transmission precision,optimizing the shape of the tooth profile can increase the logarithm of the meshing teeth and reduce the maximum contact stress in the meshing process to increase the bearing capacity.Cycloidal tooth profile has a great influence on the transmission accuracy and carrying capacity of the entire FT cycloid-pin transmission system.So,it is great necessary to study the cycloidal tooth profile modification..The traditional tooth profile modification has two main types.The first is arch back teeth profile.This type of modification results in the smallest transmission error,but it has the low carry capacity.So it can be used in drives with high precision requirements.The second is inverse arch-shaped teeth profile.This modification method produces larger transmission errors,but it has higher carrying capacity.Can be used in universal drives.Both modification methods have their own drawbacks.This paper studies a new modification method that can find a balance between transmission accuracy and carrying capacity.The tooth profile after modification can improve the carrying capacity based on ensuring the high precision of the original cycloid wheel.It can be applied to both general-purpose and high-precision transmission.This kind of modification method is mainly based on the stress curve of standard cycloid gear teeth meshing to modificate the cycloidal gear.Compared with the traditional arch back teeth profile and inverse arch-shaped teeth profile.It is proved that the stress balanced profile has good meshing performance.The Ansys contact force simulation analysis was done to verify the accuracy of VB programming calculations.Because the tooth profile obtained by this method can not be expressed by equation,it is relatively difficult to process the tooth profile.Through the idea of equivalent replacement tooth profile,an equivalent replacement based on eccentricity modification is carried out for stress balanced modification profile.The comparison between the equivalent stress balanced tooth profile and the stress balanced modification tooth profile is made to prove the equivalence.Ansys finite element analysis is carried out to verify the accuracy of the theoretical calculation.Through the experiment table design and construction of the FT drive system transmission accuracy test.The FT455 prototype was tested for transmission accuracy,rotation error and repeatable positioning accuracy.Compared with the sample FT455 prototype performance parameters,it proves that the test results of the test table are accurate and reliable.This will provide the basis for the actual production,assembly,and post-production of the cycloidal wheel with the equivalent stress balanced profile. |
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