Brake hose
AssigneeToyoda Gosei Co., Ltd.
InventorsKenichiro Furui, Satoshi Mizutani, Shigeki Okuhara, Noriyuki Kondo
Life of this patent
Estimating the term…
Abstract
A brake hose is made by laminating an inner tube rubber layer, lower yarn layer, intermediate rubber layer, upper yarn layer, and cover rubber layer. The rubber material of the inner tube rubber layer and intermediate rubber layer is a blend material in which 40 to 80 wt % is IIR and the remainder is EPDM. The upper yarn is PVA, and the upper yarn is PET, where the tensile strength per unit decitex is at least 6.5 g, and the 2.7 g elongation is 2.6±1%. The brake hose has better water penetration resistance and can be produced by a general purpose method.
Claims8
A brake hose including reinforcing layers in a rubber base, the brake hose comprising:
- an inner tube rubber layer that is made of a first rubber material and has a flow path for flowing fluid;
- a lower yarn layer formed by braiding first yarns made of a first yarn material around the inner tube rubber layer;
- an intermediate rubber layer that is made of a second rubber material and covers the lower yarn layer;
- an upper yarn layer formed by braiding second yarns made of a second yarn material around the intermediate rubber layer and;
- a cover rubber layer that is made of a third rubber material and covers the upper yarn layer,
- wherein each of the first and second rubber material is a blend in which 40 to 80 wt % is an isobutylene-isoprene copolymer (IIR) and, 20 to 60% is an ethylene-propylene-diene copolymer (EPDM),
- the first yarn material is polyethylene terephthalate (PET), with a tensile strength per unit decitex of at least 6.5 g, and 2.7 g elongation of 2.6±1%, and
- the second yarn material is polyvinyl alcohol (PVA).
Dependencies are inferred from the claim text.