Cam Profile Generation for Cam-Spring Mechanism With Desired TorqueSource: Journal of Mechanisms and Robotics:;2018:;volume( 010 ):;issue: 004::page 41009DOI: 10.1115/1.4040270Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Commercial springs have linear characteristics. Nevertheless, in some cases, nonlinear behavior (e.g., nonlinear torque) is desired. To handle that, a cam-spring mechanism with a specified cam profile was proposed in our previous work. In this paper, to further study the cam profile generation, a new convenient design method is proposed. First, the model of cam-spring mechanism considering the friction force is analyzed. Based on this model, sorts of derivation processes are conducted for obtaining the expression of spring torque. When the friction coefficient is zero, the analytical solution of the equation (spring deformation) is derived. However, in practice, where the friction coefficient is not zero, an analytical solution is not available. Therefore, a numerical solution is sought. Then, with the obtained spring deformation, the cam profile and pitch curve are generated. Results of an experiment conducted to verify the new method show that the cam profile generated by the direct derivation method can precisely mimic the desired torque characteristics. In addition, the hysteresis induced by the friction force in the cam-spring mechanism is also studied. By increasing the spring stiffness, spring free length, and the cam eccentricity, the hysteresis in the cam-spring mechanism can be decreased.
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| contributor author | Gao, Fei | |
| contributor author | Liu, Yannan | |
| contributor author | Liao, Wei-Hsin | |
| date accessioned | 2019-02-28T11:04:13Z | |
| date available | 2019-02-28T11:04:13Z | |
| date copyright | 5/31/2018 12:00:00 AM | |
| date issued | 2018 | |
| identifier issn | 1942-4302 | |
| identifier other | jmr_010_04_041009.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4252338 | |
| description abstract | Commercial springs have linear characteristics. Nevertheless, in some cases, nonlinear behavior (e.g., nonlinear torque) is desired. To handle that, a cam-spring mechanism with a specified cam profile was proposed in our previous work. In this paper, to further study the cam profile generation, a new convenient design method is proposed. First, the model of cam-spring mechanism considering the friction force is analyzed. Based on this model, sorts of derivation processes are conducted for obtaining the expression of spring torque. When the friction coefficient is zero, the analytical solution of the equation (spring deformation) is derived. However, in practice, where the friction coefficient is not zero, an analytical solution is not available. Therefore, a numerical solution is sought. Then, with the obtained spring deformation, the cam profile and pitch curve are generated. Results of an experiment conducted to verify the new method show that the cam profile generated by the direct derivation method can precisely mimic the desired torque characteristics. In addition, the hysteresis induced by the friction force in the cam-spring mechanism is also studied. By increasing the spring stiffness, spring free length, and the cam eccentricity, the hysteresis in the cam-spring mechanism can be decreased. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | Cam Profile Generation for Cam-Spring Mechanism With Desired Torque | |
| type | Journal Paper | |
| journal volume | 10 | |
| journal issue | 4 | |
| journal title | Journal of Mechanisms and Robotics | |
| identifier doi | 10.1115/1.4040270 | |
| journal fristpage | 41009 | |
| journal lastpage | 041009-7 | |
| tree | Journal of Mechanisms and Robotics:;2018:;volume( 010 ):;issue: 004 | |
| contenttype | Fulltext |