Patent US4422519A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4422519A Expired / Lapsed US ⏱️ 0.0 years remaining

Motorcycle engine exhaust system

Assignee: Yamaha Motor Co Ltd
•
Filing: 1982-01-26
•
Granted: 1983-12-27
•
Expires: 2002-01-26
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A motor cycle includes a frame, a front and rear wheel, and an engine mounted to the frame which has at least two exhaust pipes. A muffler is mounted to the frame beneath the engine, and both exhaust pipes discharge into the muffler. At least one tailpipe exhausts from the muffler. The silencing volume of the muffler can enable a shorter-than-usual tailpipe to be used, which need not interfere with access to the rear wheel axle.

Inventors

  • 👤 Kazuhiko Nomura
  • 👤 Satoru Ichikawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 15:23
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N1/00; F01N1/08; F02; F02B; F02B61/00; F02B61/02; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F01N2340/00; F01N2340/04; F01N2590/00; F01N2590/04; F02B75/02; F02B2075/022; F02B2075/027; F02B2075/1804; F02B2075/1816

Claims Analysis

Total Claims: 16
Claim 1
Independent Claim 146 words
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising: a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly to discharge into said expansion chamber, and a tailpipe having a volume and a dimension of length, exhausting from said muffler, said forward exhaust pipe and tailpipe, where they respectively enter and leave said muffler, being substantially coaxial, said rearward exhaust pipe passing downwardly rearwardly of said engine and forwardly of said rear wheel.
Claim 2
Dependent Claim 146 words
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising: a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly to discharge into said expansion chamber, and a tailpipe having a volume and a dimension of length, exhausting from said muffler, said forward exhaust pipe and tailpipe, where they respectively enter and leave said muffler, being substantially coaxial, said rearward exhaust pipe passing downwardly rearwardly of said engine and forwardly of said rear wheel.
Claim 3
Dependent Claim 32 words
An engine exhaust system according to claim 1 in which said tailpipe extends rearwardly from said muffler, and has a trailing end which terminates forwardly of the axle of said rear wheel.
Claim 4
Dependent Claim 59 words
An engine exhaust system according to claim 1 in which said muffler includes a first and a second of said expansion chambers, separated from one another by a partition, there being a communication pipe interconnecting said first and second expansion chambers, said exhaust pipes discharging into said first expansion chamber, and said tailpipe exhausting from said second expansion chamber.
Claim 5
Dependent Claim 32 words
An engine exhaust system according to claim 3 in which said tailpipe extends rearwardly from said muffler, and has a trailing end which terminates forwardly of the axle of said rear wheel.
Claim 6
Dependent Claim 31 words
An engine exhuast system according to claim 1 in which at least one of said exhaust pipes extends into said muffler for providing additional length of exhaust pipe from said engine.
Claim 7
Dependent Claim 82 words
An engine exhaust system according to claim 1 in which the engine is a four-cylinder V-type with two cylinders formed in two banks arranged forwardly and rearwardly relative to one another, and in which there is a said exhaust pipe for each said cylinder, said exhaust pipes from said forward bank curving forwardly and downwardly on opposite sides to said muffler, and said exhaust pipes from said rear bank extending rearwardly, downwardly and then forwardly to said muffler, said tailpipes extending rearwardly.
Claim 8
Dependent Claim 32 words
An engine exhaust system according to claim 6 in which said tailpipe extends rearwardly from said muffler, and has a trailing end which terminates forwardly of the axle of said rear wheel.
Claim 9
Dependent Claim 23 words
An engine exhaust system according to claim 7 in which there are two of said tailpipes, one at each side of said motorcycle.
Claim 10
Dependent Claim 59 words
An engine exhaust system according to claim 8 in which said muffler includes a first and a second of said expansion chambers, separated from one another by a partition, there being a communication pipe interconnecting said first and second expansion chambers, said exhaust pipes discharging into said first expansion chamber, and said tailpipes exhausting from said second expansion chamber.
Claim 11
Dependent Claim 26 words
An engine exhaust system according to claim 9 in which said exhaust pipes from said rear bank of exhaust pipes extend into said first expansion chamber.
Claim 12
Dependent Claim 48 words
An engine exhaust system according to claim 1 in which said rear wheel is mounted to said frame by a pair of laterally spaced-apart rearwardly extending arms which are pivoted to said frame by a pivot, said rearward exhaust pipe passing downwardly between the lanes of said arms.
Claim 13
Dependent Claim 36 words
An engine exhaust system according to claim 1 in which said rearward exhaust pipe, when it passes downwardly between the planes of said arms, passes rearwardly of the pivot which joins said arms to said frame.
Claim 14
Dependent Claim 153 words
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, said rear wheel being mounted to said frame by a pair of laterally spaced-apart rearwardly extending arms which are pivoted to said frame by a pivot, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising: a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly between said rearwardly extending arms, rearwardly of said pivot and forwardly of said rear wheel, to discharge into said expansion chamber, and a tailpipe having a volume and dimension of length, exhausting from said muffler.
Claim 15
Dependent Claim 153 words
An engine exhaust system for a motorcycle of the type having a frame, a front and rear wheel mounted to said frame, said rear wheel being mounted to said frame by a pair of laterally spaced-apart rearwardly extending arms which are pivoted to said frame by a pivot, a V type engine with at least two cylinders arranged to form a "V", and arranged forwardly and rearwardly relative to one another, said exhaust system comprising: a muffler mounted to said frame underneath said engine, said muffler having an expansion chamber, a forward exhaust pipe extending from the forwardmost cylinder forwardly and downwardly to discharge into said expansion chamber, a rearward exhaust pipe extending from the rearwardmost cylinder downwardly between said rearwardly extending arms, rearwardly of said pivot and forwardly of said rear wheel, to discharge into said expansion chamber, and a tailpipe having a volume and dimension of length, exhausting from said muffler.
Claim 16
Dependent Claim 32 words
An engine exhaust system according to claim 13 in which said tailpipe extends rearwardly from said muffler, and has a trailing end which terminates forwardly of the axle of said rear wheel.

References Cited (Backward Citations)

GB447413A Cited
US2537203A Cited
US2649083A Cited
US2940249A Cited
US3453824A Cited
US3937484A Cited
US3949829A Cited
US4226296A Cited
US4204585A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-12-26 1987-06-27 1987-12-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-12-26 1991-06-27 1991-12-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-12-26 1995-06-27 1995-12-27 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag