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US 7,255,197 B2Granted
Muffler
AssigneeToyoda Boshoku Corporation
InventorYukihisa Horiko
Life of this patent
Estimating the term…
Abstract
A muffler which reduces noises of a wide frequency band with a simple structure. Sound waves of an intake duct enter into and are received in a resonance box via a branch pipe. At the branch pipe, a movable body slidingly abuts a peripheral portion of an opening of a cut-out portion. Due to the movable body rotating, a range of opening/closing of the cut-out portion is changed, and a length of a neck portion formed by the branch pipe and an arc-shaped plate, and a lateral cross-sectional surface area of a distal end of the neck portion, are changed.
Claims15
A muffler attached to a path for intake and/or exhaust, comprising:
- a resonance box;
- a branch pipe shaped as a tube, and having a connecting portion at one side in a direction of a tube axis and a communicating portion at another side in the direction of the tube axis, and connecting the resonance box to the path, a free end of the connecting portion opening into the path, and an opening of a free end of the communicating portion being shaped as one of a curved surface and an inclined surface and opening into the resonance box;
- and
- a movable body that gradually changes an opening area of the opening and an effective length of the branch pipe from a first state to a second state wherein the opening area is greater in the second state than in the first state and the effective length is greater in the first state than in the second state.
1 more element
Dependencies are inferred from the claim text.