Various mechanical systems, such as cams and linkages, can provide special motion requirements, but noncircular gears often represent a simpler, more compact, or more accurate solution.
These oddly-shaped gears can fulfill several types of special motion requirements, and one of them may be the best solution for your application. Non-circular gear drives are used in machine tools, printing presses, textile machinery and instruments.When a machine must provide unusual displacement or speed characteristics, don’t overlook noncircular gears. In addition, other curves can be used as section curves, such as logarithmic spirals and oval curves. In the elliptical gear transmission, when the driving wheel rotates at a constant speed, the angular velocity of the driven wheel periodically changes from minimum to maximum, and from maximum to minimum. Its section curve is a pair of ellipticals of equal size. There are many types of non-circular gear transmissions, and elliptical gear transmissions are commonly used in machinery. ② The length of the two-section curve J2 must be an integral multiple of J1. ① The sum of any two instantaneous vector radii should be equal to the center distance a of the two rounds, ie r1 + r2 = a In order to achieve non-circular gear transmission, that is, to ensure that the two-wheel instantaneous trajectory is a pure rolling contact, the following two conditions must be met: Where ω1 and ω2 are the instantaneous angular velocities of the two rounds, respectively, and r1 and r2 are the instantaneous vector radii of the two rounds, respectively. Its instantaneous transmission ratio is: i12 = ω1 / ω2 = r2 / r1. When the two-wheel meshing drive, J1 and J2 make a pure roll without slip. The section curves of the two non-circular gears 1 and 2 in Fig. When a pair of non-circular gears meshes with the transmission, the instantaneous transmission ratio changes periodically according to a certain regularity.
The section surface of at least one of the gears in the transmission is not a geared surface of a rotating surface. Non-circular gear transmission refers to a gear transmission in which the section surface of at least one of the gears is not a rotating curved surface. Non-circular gears are widely used in automatic machine instrumentation and solving devices. It can improve the performance of the mechanism and improve the movement conditions of the mechanism. Artizono W11S Series Mechanical Plate Rolling Machine
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