The device which is suitable for simulating the working movement track of a kitchen water TAP

In this paper, a mechanical device is introduced, which changes the driving direction of the force through a conical gear, so as to achieve the goal of simulating the actual working state of the kitchen water TAP and improve the accuracy of detection.

Reconstitution of the geometric elements of a conic gear

Conical gears are used if the axes of the shafts between which the rotation movement is transmitted are concurrent. The technology of execution of these gears is more demanding, they are more sensitive to the deviations of execution and / or assembly and introduce large axial forces, which complicates, to some extent, the construction of the supports of the wheel support shafts. The straight-toothed conical gears, with relatively simple wheels for technological purposes, are used only at low peripheral speeds (𝑣 < 3 𝑚/𝑠), when step deviations and those of the tooth profiles do not yet produce high dynamic demands and noise. These gears, however, are sensitive to less precise mountings and to deformations, under load, of the support shafts. The calculation of the resistance of the conical gears, in contact and bending, is performed accepting the same calculation assumptions as in the calculation of cylindrical gears with straight teeth. It is, therefore, necessary to make a transition from the conical gear to an imaginary cylindrical gear, called virtual gear, and to find equivalence relations between the two gears - real and virtual.

Strength Analysis of Polymer Conical Gear Wheel Made with 3D Printing Technique

The article deals with the problem of designing conical gears with a curved line contour. The contour of the tooth flank is described by means of a helix and involutions. In the work, a conical gear designed to drive of the lower limb rehabilitation exoskeleton has analysed. Parameters of the conical gearbox have been adapted to design requirements of the exoskeleton. Gear wheels were made with ABS material using 3D printing technique. The article presents the results of strength calculations obtained using the method classical design of the gear wheals described in the norm ISO 6336-1996. In the strength calculations, bending and contact stresses were taken into account. Creating the contour of gears was aided through the gearbox wizard available in Inventor program. The work contains the results of a static tensile test of the material from which the gear wheels were made. In experimental and numerical studies, the orthotropy of the material used was taken into account. The orthogonal values of the Young’s modulus, the Poisson’s ratio and the Kirchhoff’s modulus were determined. The publication also includes partial results of fatigue tests in the area of normal stresses. In the research used to finite element method (FEM), determine of internal loads in the gear. A structure of the FEM model is described in detail. Maximum values of contact pressures determined by use to FEM models have been compared with the results obtained on the basis of Hertz’s formulas. The article presents basic geometrical and strength parameters of the designed gear. The work demonstrates the validity of the material models used. Limitations in the application of the classic method of calculating conical gears made of orthotropic materials have been indicated. The results of analytical and numerical calculations are presented in tabular and graphical form.