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公开(公告)号：EP0015700A1
公开(公告)日：1980-09-17
申请号：EP80300557.8
申请日：1980-02-26
CPC分类号： F01N13/001 , B25D17/12 , Y10S173/02
摘要： A compressed-gas-operated reciprociating-piston device, e.g. a concrete breaker, rock drill or chipping hammer, has a cylinder component of composite construction, comprising a rigid inner metal tube (40, 40A) in which the piston (12, 12A) reciprocates and a moulded outer sleeve (41,41 A) of rubber or plastics material, e.g. polyurethane, which surrounds the tube over the majority of its length and is bonded thereto. The sleeve has three integral moulded longitudinal ribs (43, 43A) in which are moulded longitudinal passages (32, 32A) for transmission of compressed air to the cylinder interior. An outer tubular muffler (50, 50A) of rubber or plastics material surrounds the composite cylinder component and defines a sound-reducing path for exhaust gas from the cylinder to the atmosphere. The exhaust gas is discharged into two spaces (83, 84, 87 or 83A, 84A) defined between two pairs of adjacent ribs (43, 43A) of the sleeve within the muffler, these two spaces forming part of an expansion chamber in the muffler. This expansion chamber communicates with the atmosphere either directly through exhaust ports (52) (Figures 1 to 3), or via a restriction (86A) and a second expansion chamber (88A, 87A) in the muffler to a final duct (91A) leading to the exhaust opening (52A) and formed in the thickness of the muffler wall (Figures 6 to 9). The combination of ribbed sleeve and muffler provides improved sound-damping and exhaust silencing for the device.
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公开(公告)号：EP0015700B1
公开(公告)日：1982-07-28
申请号：EP80300557.8
申请日：1980-02-26
CPC分类号： F01N13/001 , B25D17/12 , Y10S173/02
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