EXHAUST PIPE STRUCTURE FOR ENGINE

• Main Authors: IWATA MASATO, FURUHASHI KAZUHIRO
• Format: Patent
• Language: English
• Published: 28.10.1997
• Edition: 6
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To absorb difference of thermal elongation of an inner pipe and an outer pipe so as to improve durability by welding one-side ends of the inner pipe and the outer pipe with each other, and interposing an elastic spacer fixedly secured to either of the inner pipe and the outer pipe slidably against the other one of the inner pipe and the outer pipe between the other ends of the inner pipe and the outer pipe. SOLUTION: This exhaust manifold 14 of a four-cylinder engine is constituted so that inner pipes 17 are covered with an outer pipe 18 interposing gaps 19 between both, and the inner pipes 17 are formed so that individual exhaust pipes are connected to respective exhaust ports at one-side ends and connected to a collecting pipe 21 forming a collecting chamber 22 at the other ends. The outer pipe 18 is formed so that outer pipe half bodies 23, 24 dividable nearly along the axis lines of respective individual exhaust pipes in the inner pipes 17 are combined with each other. Between the other end of the outer pipe 18 and the other end of the inner pipe 17, namely between the end part of the collecting pipe 21 and the other end of the inner pipe, an elastic spacer 31 compressively formed out of metallic thin wire material is interposed, and the elastic spacer 31 is fixedly secured by spot welding or the like to either the inner pipe 17 and the outer pipe 18.