Patent US4428451A successfully refreshed from Google Patents.
US4428451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for a motorcycle
Assignee: Yamaha Motor Co Ltd
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Filing: 1982-02-23
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Granted: 1984-01-31
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Expires: 2002-02-23
Abstract
Abstract Several embodiments of water cooled motorcycles incorporating an improved compact arrangement wherein the components do not interfere with each other or the rider's stance. In each embodiment the engine cooling system includes a heat exchanger that is positioned on one side of the frame adjacent the down tube. An exhaust system is incorporated that includes an expansion chamber that is disposed on the opposite side of the down tube and which is connected to the engine by a U-shaped section of sufficient length so as to provide the desired exhaust performance. In some embodiments the cooling capacity is increased by employing multiple radiator sections. In each embodiment the side-to-side balance of the motorcycle is maintained by the positioning and sizing of the components.
Inventors
- 👤 Yusaku Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:01
CPC Classifications
F; F01; F01P; F01P3/00; F01P3/18; F02; F02B; F02B75/00; F02B75/16; F02B75/02; F02B2075/022; F02B2075/025; F02B61/00; F02B61/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
In a motorcycle having a frame assembly comprising a down tube, an engine supported by said frame assembly, a heat exchanger for cooling a liquid of the engine, and an exhaust pipe, the improvement comprising said heat exchanger being positioned on one side of said down tube, and including an exhaust expanison chamber positioned in part contiguous to the other side of said down tube, said exhaust pipe having a first portion extending downwardly from said engine toward the ground and a second portion extending upwardly from said first portion toward said exhaust expansion chamber and communicating with said exhaust expansion chamber.
Claim 2
Dependent Claim
102 words
In a motorcycle having a frame assembly comprising a down tube, an engine supported by said frame assembly, a heat exchanger for cooling a liquid of the engine, and an exhaust pipe, the improvement comprising said heat exchanger being positioned on one side of said down tube, and including an exhaust expanison chamber positioned in part contiguous to the other side of said down tube, said exhaust pipe having a first portion extending downwardly from said engine toward the ground and a second portion extending upwardly from said first portion toward said exhaust expansion chamber and communicating with said exhaust expansion chamber.
Claim 3
Dependent Claim
24 words
A motorcycle as set forth in claim 1 wherein the first and second portion of the exhaust pipe are interconnected by a curved section.
Claim 4
Dependent Claim
18 words
A motorcycle as set forth in claim 1 wherein the heat exchanger is supported by the down tube.
Claim 5
Dependent Claim
24 words
A motorcycle as set forth in claim 3 wherein the first and second portion of the exhaust pipe are interconnected by a curved section.
Claim 6
Dependent Claim
30 words
A motorcycle as set forth in claim 1 wherein the heat exchanger comprises a first section juxtaposed to the down tube and a second section extending above the down tube.
Claim 7
Dependent Claim
24 words
A motorcycle as set forth in claim 5 wherein the first and second heat exchanger sections are disposed at an angle to each other.
Claim 8
Dependent Claim
87 words
A motorcycle as set forth in claim 5 wherein the frame assembly further includes a head tube connected to the down tube, one of the heat exchanger sections being juxtaposed to and supported by the head tube, and further including a saddle-shape fuel tank juxtaposed at its forward end to said head tube, said fuel tank having recess formed in the side thereof on the one side of the head tube for clearing the heat exchanger section and a forwardly extending portion on the other side thereof.
Claim 9
Dependent Claim
24 words
A motorcycle as set forth in claim 7 wherein the first and second heat exchanger sections are disposed at an angle to each other.
Claim 10
Dependent Claim
61 words
A motorcycle as set forth in claim 5 wherein the frame assembly further includes a head tube affixed to the down tube, the first and second heat exchanger sections being juxtaposed to the down tube and head tube respectively, and further including a third heat exchanger section supported on the other side of the head tube and above the expansion chamber.
Claim 11
Dependent Claim
24 words
A motorcycle as set forth in claim 9 wherein the first and second heat exchanger sections are disposed at an angle to each other.
Claim 12
Dependent Claim
34 words
A motorcycle as set forth in claim 10 wherein the second and third heat exchanger sections are supported by the head tube and the first heat exchanger section is supported by the down tube.
Claim 13
Dependent Claim
36 words
A motorcycle as set forth in claim 1 wherein the heat exchanger comprises first and second sections positioned on opposite sides of the frame and said second heat exchanger section being disposed above the expansion chamber.
Claim 14
Dependent Claim
89 words
In a motorcycle having a frame assembly comprising a head tube, a down tube, an engine supported by said frame assembly, a fuel tank supported by said frame assembly and extending transversely on opposite sides of said head tube, and a heat exchanger for cooling a liquid of the engine, the improvement comprising said heat exchanger being positioned on one side of said head tube and said fuel tank having a recess in its forwardmost portion on said one side of said head tube for clearing said heat exchanger.
Claim 15
Dependent Claim
89 words
In a motorcycle having a frame assembly comprising a head tube, a down tube, an engine supported by said frame assembly, a fuel tank supported by said frame assembly and extending transversely on opposite sides of said head tube, and a heat exchanger for cooling a liquid of the engine, the improvement comprising said heat exchanger being positioned on one side of said head tube and said fuel tank having a recess in its forwardmost portion on said one side of said head tube for clearing said heat exchanger.
Claim 16
Dependent Claim
39 words
A motorcycle as set forth in claim 13 wherein the fuel tank has a portion extending forwardly of the recess on the opposite side of the head tube of sufficient capacity to balance the weight of the heat exchanger.
Claim 17
Dependent Claim
53 words
A motorcycle as set forth in claim 13 wherein in the heat exchanger is comprised of first and second sections, the first section being juxtaposed to the head tube and the fuel tank recess and the second section being juxtaposed to the corresponding side of the down tube and beneath the fuel tank.
Claim 18
Dependent Claim
24 words
A motorcycle as set forth in claim 15 wherein the first and second heat exchanger sections are disposed at an angle to each other.
Claim 19
Dependent Claim
30 words
A motorcycle as set forth in claim 15 further including a third heat exchanger section disposed on the side of the head tube opposite to the first heat exchanger section.
Claim 20
Dependent Claim
24 words
A motorcycle as set forth in claim 17 wherein the first and second heat exchanger sections are disposed at an angle to each other.
References Cited (Backward Citations)
US4226296A
Cited
US4237996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |