Molded brake pad
US4617165A · kind A · utility
Inventors
Key dates
| Filing date | May 13, 1985 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | May 13, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D69/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A composition of material for use as a friction material in a brake and its method of manufacture. Liquid double salts of dibasic and monobasic (ammonium-potassium hydrogen) phosphoric acid (DSP) is added to a dry mixture of reinforcing fiber, friction modifiers, fillers and phenolic resin to create a high viscosity slurry. Thereafter, a metallic (magnesium) oxide and para formaldehyde (para) are added to the slurry. Molds which have been previously heated are filled with the slurry and any excess removed. The metallic oxide reacts with the DSP and the para reacts with the phenolic resin to create a two binder matrix for holding the reinforcing fiber, friction material and fillers in a fixed relationship corresponding to the shape of a brake pad. The brake pads are removed from the molds and transported to a ventilated chamber where the internal curing proceeds at or near ambient temperature to complete the manufacture of the brake pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.