Abstract
Noncircular gear and curve face gear are collectively referred to as spatial noncircular gear. Combined with the transmission characteristics of spatial noncircular gear, a new classification design method of spatial noncircular gear continuously variable transmission (CVT) pattern was proposed, including two categories named addition type and multiplication type, with a total of five subcategories. Through the combination of the transmission ratio changing mechanism and transmission selection mechanism, it can realize the CVT. The overall transmission ratio depends on the phase angle between the spatial noncircular gear pairs and is independent of the input rotation angle. Firstly, the CVT principle and transmission ratio characteristics of each pattern were analyzed. Then the tooth profile classification design of spatial noncircular gear was carried out, and the general parametric design equations of the tooth surface with different tooth profiles were obtained. Finally, through simulation, the overall transmission ratio of each pattern was compared between theory and simulation, which verified the correctness of the CVT classification design method. The advantages and disadvantages of the two categories were analyzed. Moreover, through the transmission experiments of curve face gear pairs with different tooth profiles, the transmission ratios were compared between theory and experiment. Considering the influencing factors such as machining error, assembly error and measurement error, the experimental error is within a reasonable error range, which verified the correctness of the tooth profile classification design method. This study provides a new idea for the further research and application of spatial noncircular gear CVT.
Highlights
Noncircular gear is a mechanism that can realize the non-uniform speed ratio transmission between the driving gear and driven gear [1]
CVTpattern patterncan canbebe divided into categories, a Spatial noncircular noncircular gear divided into twotwo categories, withwith a total total of subcategories, five subcategories, as shown in 1Table and Figure
For the three classes included in type I, the transmission ratio changing part is composed switching mechanism, which is responsible for adjusting the phase angle between the two driving spatial noncircular gears and synchronizing their rotation speed at the same time
Summary
Noncircular gear is a mechanism that can realize the non-uniform speed ratio transmission between the driving gear and driven gear [1]. Creatively proposed a new type of curve face gear pair, which can realize the variable transmission ratio transmission between intersecting shafts, and analyzed its principle and motion characteristics. Sun et al [17] proposed a heartshaped gear CVT device based on the principle of noncircular gear variable transmission ratio, and introduced its mathematic model and kinematic characteristics. For design difficulty and mechanism kinematic characteristics, the spatial noncircular gear CVT mechanism combined the characteristics of a spatial noncircular gear pair, a transmission ratio changing mechanism, a transmission selection mechanism, and multiple branches. The pattern classification and design, transmission principle, and simulation of spatial noncircular gear CVT pattern were carried out.
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