The effect of the teeth profile shape on polymer gear pair properties

Abstract

Original scientific paper The paper presents an extensive research on two different tooth-flank geometries, i.e. involute and S-gears. A significant difference between the two analyzed geometries was observed during the lifetime testing. The tests were conducted on special test equipment with an axis distance of 20 mm. The material used for the tested gears was POM for the driver gear and PA6 for the driven gear. The same sizes of driver and driven gears were used (m = 1 mm, z = 20). Gears of this size are particularly suitable for micro-gear transmissions. The tests were carried out using different rotational speeds and torques, between 0,8 N·m and 1,5 N·m. During testing the thermal state of the gears was measured with a thermal camera. The stress and deformation analyses of the tested gears were undertaken using numerical simulations employing the finite-element method. Keywords: failure; involute gears; polymer; S-gears; temperature Utjecaj oblika profila zuba na svojstva para polimernih zupčanikaOriginal scientific paper U radu se predstavlja opsežno istraživanje dviju različitih geometrija boka zuba t.j. evolventnih i S-zupčanika. Zapažena je značajna razlika između te dvije analizirane geometrije tijekom ispitivanja njihovog vijeka trajanja. Ispitivanja su provedena na posebnoj opremi za ispitivanje s udaljenošću vratila od 20 mm. Materijal ispitivanih zupčanika bio je POM za pogonski zupčanik i PA6 za pogonjeni zupčanik. Rabljene su iste veličine pogonskog i pogonjenog zupčanika (m = 1 mm, z = 20). Zupčanici te veličine su naročito pogodni za mikro zupčanični prijenos. Ispitivanja su provedena uz različite brzine vrtnje i okretne momente, između 0,8 N·m i 1,5 N·m. Tijekom ispitivanja toplinskom se kamerom mjerilo toplinsko stanje zupčanika. Analize naprezanja i deformacije ispitivanih zupčanika provedene su numeričkom simulacijom primjenom metode konačnih elemenata.

High-Speed Camera Based Optical Measurement Methods for In-Mesh Tooth Deflection Analysis of Thermoplastic Spur Gears

“…At higher loads the typical failure mode can be similar: (ii) wear was e.g. observed on steel/POM, steel/HDPE (high-density polyethylene) and steel/POM pairs (Singh et al [6]), (iv) root fracture induced in this case by stress overload, as observed for POM/ PA6 pairs by Pogac ˇnik et al [7] and Duhovnik et al [8] and for steel/PA66 by Sarita et al [5]. In addition, permanent viscoelastic/viscoplastic strain accumulation (v) can also occur at higher loads, as identified on steel/PA66 pairs by Sarita et al [5] and on POM/PA66 pairs by Pogac ˇnik et al [7].…”

Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review

“…In this case, a higher load capacity of the S-gears was measured. Results on research concerning polymer S-gears were published in several papers [82] to [85]. A comparison of the efficiency of S-gears and involute gears was made.…”

Augmented Reality Aided Inspection of Gears

“…Gears are essential elements in engineering. Ensuring their quality and ensuring optimal parameters of manufacturing is, therefore, crucial [1,2]. An accurate, holistic, and simple method of inspection is needed for accurately produced gears.…”