US4606310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase for multi-cylinder engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1984-09-25
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Granted: 1986-08-19
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Expires: 2004-09-25
Abstract
Abstract An improved engine and transmission casing assembly for a motorcycle that is made up of three major components. A first casing forms the engine and a portion of the crankcase for the engine. A second casing mates with the first casing and with it rotatably journals a pair of parallel crankshafts and further defines a transmission casing. The transmission casing is defined by a cavity that contains primary and secondary shafts and interengaging gears and which opens through one face of the second casing for insertion of the gears and shafts through this opening. This opening is closed by a cover plate which in part journals the transmission shafts.
Inventors
- 👤 Sakae Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0002; F02F7/0012; F02B; F02B61/00; F02B61/02; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1816; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
146 words
A combined engine transmission case comprising a first casing forming a portion of the crank chamber of said engine, a second casing forming a transmission case and fixed relative to said first casing, an engine output shaft journaled within said crank chamber at an interface between said first and second casings for rotation about a first axis lying in a plane defined by said interface, said second casing being formed with an internal cavity sealed from said crank chamber and an opening in one side thereof facing in a direction parallel to said first axis, a transmission shaft insertable into said internal cavity through said opening, means for driving said transmission shaft from said engine output shaft, and a cover plate closing said second casing opening and at least in part journaling said transmission shaft for rotation about a second axis parallel to said first axis.
Claim 2
Dependent Claim
146 words
A combined engine transmission case comprising a first casing forming a portion of the crank chamber of said engine, a second casing forming a transmission case and fixed relative to said first casing, an engine output shaft journaled within said crank chamber at an interface between said first and second casings for rotation about a first axis lying in a plane defined by said interface, said second casing being formed with an internal cavity sealed from said crank chamber and an opening in one side thereof facing in a direction parallel to said first axis, a transmission shaft insertable into said internal cavity through said opening, means for driving said transmission shaft from said engine output shaft, and a cover plate closing said second casing opening and at least in part journaling said transmission shaft for rotation about a second axis parallel to said first axis.
Claim 3
Dependent Claim
50 words
A combined engine transmission case as set forth in claim 1 wherein the first casing defines a pair of cylinder banks and there are a pair of engine output shafts journaled about respective first axes lying in a same plane and in the interface between the first and second casings.
Claim 4
Dependent Claim
29 words
A combined engine transmission case as set forth in claim 2 further including a balancer shaft driven by the engine output shafts for balancing reciprocating masses of the engine.
Claim 5
Dependent Claim
33 words
A combined engine transmission case as set forth in claim 3 wherein the balancer shaft rotates about an axis disposed in the same plane as the axes of rotation of the output shafts.
Claim 6
Dependent Claim
37 words
A combined engine transmission case as set forth in claim 1 wherein there are a pair of transmission shafts inserted into the internal cavity through the opening and the cover plate journals both of the transmission shafts.
Claim 7
Dependent Claim
23 words
A combined engine transmission case as set forth in claim 5 wherein the transmission shafts carry a plurality of interengaging change speed gears.
Claim 8
Dependent Claim
32 words
A combined engine transmission case as set forth in claim 6 wherein one of the transmission shafts comprises an input shaft and has an input gear driven by the engine output shaft.
Claim 9
Dependent Claim
59 words
A combined engine transmission case as set forth in claim 7 wherein the first casing defines a pair of cylinder banks and there are a pair of engine output shafts journaled about respective first axes lying in a same plane and in the interface between the first and second casings, each of said outputs shafts driving the input shaft.
Claim 10
Dependent Claim
29 words
A combined engine transmission case as set forth in claim 8 further including a balancer shaft driven by the engine output shafts for balancing reciprocating masses of the engine.
Claim 11
Dependent Claim
33 words
A combined engine transmission case as set forth in claim 9 wherein the balancer shaft rotates about an axis lying in the same plane as the axes of rotation of the output shafts.
Claim 12
Dependent Claim
30 words
A combined engine transmission case as set forth in claim 10 wherein the first and second casings define a plurality of crank chambers for containing the respective engine output shafts.
Claim 13
Dependent Claim
41 words
A combined engine transmission case as set forth in claim 1 wherein the means for driving the transmission shaft from the engine output shaft comprises drive means positioned externally of the crank chamber and the internal cavity of the second casing.
Claim 14
Dependent Claim
41 words
A combined engine transmission case as set forth in claim 5 wherein the means for driving the transmission shaft from the engine output shaft comprises drive means positioned externally of the crank chamber and the internal cavity of the second casing.
Claim 15
Dependent Claim
41 words
A combined engine transmission case as set forth in claim 11 wherein the means for driving the transmission shaft from the engine output shaft comprises drive means positioned externally of the crank chamber and the internal cavity of the second casing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |