Hydrogenated butadiene-nitrile rubber elastomers: research of functional properties

The subject of the study were rubbers based on partially and fully hydrogenated nitrile-butadiene rubbers (HNBR) Therban АТ 5065 VP and Therban АТ 5005 VP, taken individually and in the ratios 80:20, 70:30, 60:40, 50:50 accordingly. The purpose of the work was to study the functional properties of rubbers based on HNBR of various degrees of unsaturation using modern methods of analysis. The degree of dispersion of the filler and the thermodynamic compatibility of polymer components in rubbers based on Therban АТ 5065 VP and Therban АТ 5005 VP mixtures are appreciated. Glass transition and decomposition temperatures, elastic modulus and mechanical loss tangent of HNBR-based and their combined compositions were identified. The microrelief of the surface of rubber samples based on HNBR, taken in different ratios, was investigated.

A study on the development and application of program for planetary gear design considering planetary gear noise and efficiency

In general, gear mechanical loss is associated with the friction of the lubricating contact surface of the gear and bearing that transmit the power, and a no-load spin loss which is load independent occurs due to gear rotation and the interaction of the bearing component with the lubricating element. In order to minimize planetary gear loss, it is desirable to design by checking the efficiency at the concept design stage. However, a design technique that considers the noise and efficiency of a planetary gear set simultaneously has not been achieved so far. In this paper, a program called 'pRMC with EHL' to check together the efficiency and noise that affected by gear specifications has been developed. By using developed program, planetary gear sets specifications have been designed. And through the experimental evaluation, automatic transmission efficiency could be reduced by 0.3% in combination fuel consumption mode and the planetary gear vibration could be also reduced by 10 dB than former design. Through this designing verification and input parameter correlation, a new planetary gear set designing process has been come up with successfully at the concept design stage.

Investigation of the elastic and hysteresis properties of tread rubber tires with silica

The influence of different types of silica, differing in quality characteristics, on the complex modulus of rubbers, their elastic modulus, loss modulus, and also on the tangent of angle of mechanical loss are investigated. Mineral fillers silica 1 and silica 2 are introduced at a dosage of 80.00 phr into filled elastomeric compositions based on combination of synthetic styrene-butadiene and polybutadiene rubbers, used for the manufacture of treads for passenger tires. The tests are carried out on a dynamic mechanical analyzer by cyclic compression of vulcanizates in the temperature range 20–70°С. It is established that vulcanizates with silica 2 are characterized by 8–56% lower value of the complex modulus. It is revealed that rubbers containing a silica 2, depending on temperature, have 13–36% lower values of the elastic modulus and 19–46% lower values of the loss modulus in comparison with samples filled with silica 2. It is determined that in the temperature range from 20 to 70°C vulcanizates with silica 2 are characterized by 7–12% lower values of the tangent of angle of mechanical loss. As a result of the study, it is established that it is the most expedient to introduce mineral filler silica 2 into the formulation of tread rubber compounds for passenger tires. This will make it possible to obtain vulcanizates with increased elasticity and adhesion to the road surface, as well as lower heat losses to the environment and fuel consumption.