This paper proposes a method of the preliminary geometric design for gear tooth profiles based on given sliding coefficients. A design procedure is developed and a simplified derivation of the mathematical model of tooth profiles is presented. The characteristics of the gear drive designed by the proposed method are analyzed. A comparison study on the sliding coefficient with the involute gear drive is also carried out in this work. The effects of parameters, including tooth number and modulus, on the characteristics of the gear drives are studied. The contact and bending stresses of this new drive are also analyzed. A manufacturing method of the proposed gear is studied, and a simulation of the machining process demonstrates its feasibility. The results show that the designers can design tooth profiles according to required sliding coefficients by the proposed method.
A novel friction drive—a metal belt drive with magnets (MBDM)—is proposed in this paper, and its structure and principle are introduced. Based on theories of friction drive and electromagnetism, a mechanical model of the MBDM is presented and a Euler formula of this drive is deduced. Finally, several performance parameters of the MBDM are experimentally measured and compared to conventional belt drives. The results show that the MBDM transmits motion and power by using the coupling action between the magnetic attraction and initial tension. The transmission efficiency of the MBDM can reach 95-98%, while its elastic creep rate is <0.1% under normal running conditions.
This paper brings forward a monocular vision detection algorithm in allusion to the specific object’s pose based on Hausdorff Distance. At first, according to the mathematic model which has been established, the 2D template sequence is generated by projecting the specific object in different poses into the image plane of a virtual camera. Then, in order to predigest calculations and accelerate the matching speed during the image matching, the algorithm adopts the local-mean Hausdorff Distance as matching estimate and adopts the search strategy based on hiberarchy which reduces the searching rang by the threshold method before accurate match. In the end of this paper, the experiment that measures the poses of the clamp via the different clamp images respectively is given to testify the validity and speediness of this algorithm.
The working profile of the roller gear indexing cam is sophisticated space curved surface. It is difficult to get the 3D model with conventional cartography. In this paper, a parameter molding method of the roller gear indexing cam based on VB and UG is provided. A system is compiled.The Simulation and Kinematics Analysis of the roller gear indexing cam mechanism can be done after the parameters are completely set. It hopes that the flaw and other problem in design can be found though this simulation and kinematics analysis, which is facilitate the designer to improve the design in time.
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