Silencer for motorcycle

Claim 2

In a tail cap of a silencer for a motorcycle comprising an outer cylindrical member having a diameter to fit on and around one end of an exhaust pipe, an inner cylindrical member concentrically positioned in said outer cylindrical member, and a spacer to maintain said outer and inner cylindrical members at an equal distance for their concentricity, the improvement comprising a multiplicity of spacers radially extending from said inner cylinder toward the inner surface of said outer cylinder in an arcuate shape in longitudinal cross-section to define, by and between adjacent spacers, openings constituting the exhaust gas outlet.

Claim 3

A tail cap of a silencer for a motorcycle, comprising: (a) an outer cylinder having a diameter to snugly fit around an end of an exhaust pipe; (b) an inner cylinder associated with the outer cylinder at the outer end thereof to form a V-shaped cross-section along the lengthwise direction; (c) another cylindrical portion internal to the inner cylinder; (d) a plurality of spacers radially extending between said internal cylindrical portion and said inner cylinder, said spacers having the same depth as that of said cylinders, and openings defined by and between adjacent spacers constituting exhaust gas outlets; (e) innermost cylinder concentrically disposed with said outer cylinder, inner cylinder, and internal cylindrical portion; (f) a plurality of spacers radially extending between said innermost cylinder and said internal cylindrical portion, said spacers having the same depth as that of said cylinders; and (g) a parabolic disc member covering the space between said innermost cylinder and said internal cylindrical portion.

Claim 4

A tail cap of a silencer for a motorcycle, comprising: (a) an outer cylinder having a diameter to snugly fit around an end of an exhaust pipe; (b) an inner cylinder associated with the outer cylinder at the outer end thereof to form a V-shaped cross-section along the lengthwise direction; (c) another cylindrical portion internal to the inner cylinder; (d) a plurality of spacers radially extending between said internal cylindrical portion and said inner cylinder, said spacers having the same depth as that of said cylinders, and openings defined by and between adjacent spacers constituting exhaust gas outlets; (e) innermost cylinder concentrically disposed with said outer cylinder, inner cylinder, and internal cylindrical portion; (f) a plurality of spacers radially extending between said innermost cylinder and said internal cylindrical portion, said spacers having the same depth as that of said cylinders; and (g) a parabolic disc member covering the space between said innermost cylinder and said internal cylindrical portion.

Claim 5

The improvement as set forth in claim 1, wherein a plurality of grooves are formed in the outer peripheral surface of said outer cylinder in and along the direction of the generatrix thereof.

Claim 6

The tail cap as set forth in claim 1 or 2, which is formed by casting aluminum and the like metal material having relatively light weight and good heat dissipating factor.

Claim 7

The tail cap as set forth in claim 1 or 2, wherein said cap is formed as thick as possible in gauge to an extent that it does not sacrifice lightness in weight.

Claim 8

The tail cap as set forth in claim 1 or 2, wherein it is formed integral with the tail pipe of the silencer.