Gearing pump of variable flow

• Grant number: 99/11673-7
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: October 01, 2000
• End date: September 30, 2005
• Field of knowledge: Engineering - Mechanical Engineering - Mechanical Engineering Design
• Principal Investigator: José Luis Bertazzoli
• Grantee: José Luis Bertazzoli
• Company: Hidrometal Indústria e Comércio de Equipamentos Hidráulicos Ltda. - EPP
• City: Limeira

Abstract

The objective of the project is to develop a gearing pump of variable flow. The expression V = M. pd. W determines the volume of fluid displaced per turn, with m = module, pd = primitive diameter and W = useful width of the gearing. The dimension “W” is also defined as the position in which the gears are connected among themselves, that can vary from zero up to a maximum limit. The empty spaces between the teeth on the linking sides of the gears are filled by the teeth of internal gears, with such precision that they prevent leaks. The gearing of the internal teeth, that seals the motor gearing, have axial movement. The gearing of the internal teeth, that cover the mobile gearing, do not possess this movement. The gear movement of the mobile gearing is free in the axial paths and also acts as a command piston of outflow and pressure, doing away with what in the competing products is an expensive accessory. The piston advance results from the internal forces transmitted by the pressure of the command oil and by the pressure in the gearing chamber. The recoil of the piston is carried out through the alleviation of the command oil, which increases the resultant internal force on gears’ side. If these opposite forces balance each other out with springs, economic and reliable load sensing control is obtained. (AU)