Patent US4427088A successfully refreshed from Google Patents.
US4427088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power unit apparatus for motorcycles
Assignee: Honda Motor Co Ltd
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Filing: 1982-04-19
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Granted: 1984-01-24
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Expires: 2002-04-19
Abstract
Abstract Power unit apparatus for a motorcycle driven by an internal combustion engine has a split power unit case. The crankshaft and the driving shaft of a reduction gear mechanism are clamped between the upper and lower sections of the power unit case. The driven shaft is located on the lower section. A guide shaft for shifter forks and a shift drum controlling operation of the shifter forks are both located on the upper section above the driving and driven shafts.
Inventors
- 👤 Masaharu Tsuboi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:10
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/02; F16H3/16; F02; F02B; F02B61/00; F02B61/02; F02B61/06; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/02; F02B2075/022; F02B2075/027; F02B2075/1804; F02B2075/1808; F02B2275/00; F02B2275/18; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19386; Y10T74/194; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
Power unit apparatus for a motorcycle including an internal combustion engine having a crankshaft, and having a power unit case combining a crankcase and a transmission case, comprising, in combination: a main shaft associated with the crankcase, a counter shaft adapted to drive a rear wheel of the motorcycle, a reduction gear mechanism for driving said counter shaft from said main shaft, said mechanism having a guide shaft supporting shift forks for shifting said mechanism, a shift drum for actuating said shift forks, said power unit case being divided into an upper section and a lower section so that said crankshaft and said main shaft are supported on the dividing plane between said sections, said guide shaft and said shift drum being supported on said upper section above said main shaft and said counter shaft, said counter shaft being supported on said lower section.
Claim 2
Dependent Claim
144 words
Power unit apparatus for a motorcycle including an internal combustion engine having a crankshaft, and having a power unit case combining a crankcase and a transmission case, comprising, in combination: a main shaft associated with the crankcase, a counter shaft adapted to drive a rear wheel of the motorcycle, a reduction gear mechanism for driving said counter shaft from said main shaft, said mechanism having a guide shaft supporting shift forks for shifting said mechanism, a shift drum for actuating said shift forks, said power unit case being divided into an upper section and a lower section so that said crankshaft and said main shaft are supported on the dividing plane between said sections, said guide shaft and said shift drum being supported on said upper section above said main shaft and said counter shaft, said counter shaft being supported on said lower section.
Claim 3
Dependent Claim
28 words
The combination set forth in claim 1 in which a coolant pump for the engine is mounted on said lower section and is driven from said main shaft.
Claim 4
Dependent Claim
32 words
A power unit apparatus as claimed in claim 1 in which the engine is multicylinder and of the V-type in which the crankshaft is transverse to the running direction of the motorcycle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |