Design Analysis of a Portable Manual Tyre Changer

Abstract

In this paper, an efficient, affordable, and portable manual automobile tyre changing tool was designed. The tool operates on the principle of second-class levers, where the load to be overcome is situated between the fulcrum and the effort point. The mechanical advantage (MA) of the bead breaker arm and pry bar assembly of the tool was determined to be 11.5. The standard tube size of the bead breaker arm that can withstand stress due to bending moment was determined to be a 2” (50mm) diameter Schedule 80 steel tube. Also, the dimensions of the standard hexagonal bolts to be used at the fulcrum and load point of the bead breaker arm are M12 × 1.5 × 75 mm, while the standard size of hexagonal nuts to be used with the bolts is M12 × 1.5 mm with a height of 10mm. Moreover, the mechanical advantage (MA) of the mount/demount arm and pry bar assembly of the tool was determined to be 5.22. Also, by comparing the angles of twist of two sizes of the mount/demount arm when the tool is used in mounting or demounting a tyre on a 16” × 7” wheel rim, the standard size of the mount/demount arm that can withstand stresses due to bending moment and torsional moment was determined to be a 60mm × 60mm × 5mm square tube. The cost of materials needed to fabricate the tyre changer summed up to ?21,000. Ergo, the design provides an alternative portable and relatively affordable tyre changing tool that can be afforded by tyre technicians across Nigeria, and other developing or underdeveloped countries.

Biodegradable Cutting Fluids Evaluation for Sustainable Machining Processes

“…It has a melting point of −16 °C. At room temperature, the density of soybean oil is about 0.922 g/cm 3 and its viscosity is about 65 cP. The palm oil ranked consists of about 44% palmitic acid, 39% oleic acid, 10% linoleic acid, 4% stearic acid.…”

“…It has a melting point of about 33 °C. At room temperature, the density of palm oil is about 0.89 g/cm 3 and its viscosity is about 50 cP. The polyalphaolefin ranked has a pour point of about −50 °C, density of about 0.8 g/cm 3 , and viscosity of 16 cP.…”

“…At room temperature, the density of palm oil is about 0.89 g/cm 3 and its viscosity is about 50 cP. The polyalphaolefin ranked has a pour point of about −50 °C, density of about 0.8 g/cm 3 , and viscosity of 16 cP. The trimethylpropane trioleates has a pour point of about −40 °C, density of about 0.95 g/cm 3 and viscosity of about 47.5 cP.…”

“…The polyalphaolefin ranked has a pour point of about −50 °C, density of about 0.8 g/cm 3 , and viscosity of 16 cP. The trimethylpropane trioleates has a pour point of about −40 °C, density of about 0.95 g/cm 3 and viscosity of about 47.5 cP. The polyethylene glycol ranked has a melting point of about 17 °C, density of about 1.12g/cm 3 and viscosity of about 1.79 cP.…”

“…Products of metal working supply chains are very common in our daily lives [1][2][3][4] . These products are indispensable due to their unique properties and versatility such as strength and durability, versatility, conductivity, corrosion resistance, recyclability, good weight-to-strength ratio as well as aesthetic appeal 5,6 .…”