Patent ID: 8936248
Filing Date: 2015-01-20
Classification: F02B,F16J

Abstract:
1. A boot seal for variable compression-rate engine, the boot seal being mounted onto a variable compression-rate engine that changes a volume of a combustion chamber by changing relative positions between a cylinder block and a crankcase, the boot seal covering between the cylinder block and the crankcase, and having an opposite end to be fixed to the cylinder block and another opposite end to be fixed to the crankcase, the boot seal comprising: a boot-seal element including an inner layer being disposed on an inner face thereof and being composed of a fluorinated rubber, and an outer layer being disposed on a more outer side than is the inner layer, the boot-seal element having an elastically deformable cylindrical bellows shape having a root that dents inward diametrically from being formed in a circumferentially developed state so as to have circumferential ends and then being completed by joining the circumferential ends with each other; and a reinforcement member including an annular reinforcement member extending annularly around the boot-seal element and over an entire circumferential direction of the boot-seal element and a reinforced fibrous assembly being disposed at least in the root of the cylindrical bellows-shaped boot-seal element between the inner layer of the boot-seal element and the outer layer, the reinforced fibrous assembly comprising woven yarns selected from woven and knitted fabrics made of reinforced fiber, exhibiting woven directions inclining with respect to the circumferential direction of the boot-seal element and having intersections of the woven yarn joined together.