US5044333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balancing arrangement for internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1990-06-01
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Granted: 1991-09-03
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Expires: 2010-06-01
Abstract
Abstract A balancer arrangement for a two cylinder in-line internal combustion engine that includes a drive gear formed on the crankshaft between a pair of throws and between a pair of bearing surfaces. A pair of balance shafts are driven from this drive gear and have inertial masses coupled to them through a torsional vibration damper. The inertial masses are disposed between the adjacent pair of cylinders and within the crankcase so as to provide a compact engine.
Inventors
- 👤 Wataru Fuchigami
- 👤 Yoji Utsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:53
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/22; F16F15/26; F16F15/264; F16F15/265; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F02B75/02; F02B2075/022; F02B2075/027; F02B2075/1804; F02B2075/1808; F02B2275/00; F02B2275/18; F02B67/00; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2173; Y10T74/2183; Y10T74/2184
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
98 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about an axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation with a respective one of said balance shaft and located in the area between said adjacent cylinder bores.
Claim 2
Dependent Claim
98 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about an axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation with a respective one of said balance shaft and located in the area between said adjacent cylinder bores.
Claim 3
Dependent Claim
50 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 1 wherein the crankshaft is formed with a pair of spaced bearing surfaces on opposite sides of the drive gear and the inertial masses are disposed between portions of the engine journalling said spaced bearing surfaces.
Claim 4
Dependent Claim
30 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 1 further including torsional damping means for rotatably coupling the inertial masses to the balance shafts.
Claim 5
Dependent Claim
39 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 3 wherein the balance shafts are formed with a gear portion engaged with the crankshaft drive gear and a hub portion journalling the inertial masses.
Claim 6
Dependent Claim
50 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 4 wherein the crankshaft is formed with a pair of spaced bearing surfaces on opposite sides of the drive gear and the inertial masses are disposed between portions of the engine journalling said spaced bearing surfaces.
Claim 7
Dependent Claim
27 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 1 wherein the inertial masses are positioned in part in the engine crankcase.
Claim 8
Dependent Claim
50 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 6 wherein the crankshaft is formed with a pair of spaced bearing surfaces on opposite sides of the drive gear and the inertial masses are disposed between portions of the engine journalling said spaced bearing surfaces
Claim 9
Dependent Claim
30 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 6 further including torsional damping means for rotatably coupling the inertial masses to the balance shafts.
Claim 10
Dependent Claim
39 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 8 wherein the balance shafts are formed with a gear portion engaged with the crankshaft drive gear and a hub portion journalling the inertial masses.
Claim 11
Dependent Claim
50 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 9 wherein the crankshaft is formed with a pair of spaced bearing surfaces on opposite sides of the drive gear and the inertial masses are disposed between portions of the engine journalling said spaced bearing surfaces.
Claim 12
Dependent Claim
118 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about an axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, said crankshaft being formed with a pair of spaced bearing surfaces on opposite sides of said drive gear, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation with a respective one of said balance shafts and located between portions of said engine journalling said spaced bearing surfaces.
Claim 13
Dependent Claim
118 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about an axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, said crankshaft being formed with a pair of spaced bearing surfaces on opposite sides of said drive gear, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation with a respective one of said balance shafts and located between portions of said engine journalling said spaced bearing surfaces.
Claim 14
Dependent Claim
27 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 11 wherein the inertial masses are positioned in part in the engine crankcase.
Claim 15
Dependent Claim
30 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 12 further including torsional damping means for rotatably coupling the inertial masses to the balance shafts.
Claim 16
Dependent Claim
39 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 13 wherein the balance shafts are formed with a gear portion engaged with the crankshaft drive gear and a hub portion journalling the inertial masses.
Claim 17
Dependent Claim
92 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about at axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation by torsional damping means with a respective one of said balance shafts.
Claim 18
Dependent Claim
92 words
A balancing shaft arrangement for an internal combustion engine having a pair of aligned, adjacent cylinder bores, a crankshaft journalled for rotation about at axis at one end of said cylinder bores and having a pair of adjacent throws, a drive gear formed on said crankshaft between said throws, a pair of balancer shafts rotatably journalled about axes parallel to said crankshaft axis and driven by said drive gear, and a pair of eccentrial inertial masses each affixed for rotation by torsional damping means with a respective one of said balance shafts.
Claim 19
Dependent Claim
39 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 15 wherein the balance shafts are formed with a gear portion engaged with the crankshaft drive gear and a hub portion journalling the inertial masses.
Claim 20
Dependent Claim
50 words
A balancing shaft arrangement for an internal combustion engine as set forth in claim 16 wherein the crankshaft is formed with a pair of spaced bearing surfaces on opposite sides of the drive gear and the inertial masses are disposed between portions of the engine journalling said spaced bearing surfaces.
References Cited (Backward Citations)
GB844071A
Cited
JPS4943737A
Cited
US4300493A
Cited
JPS6078133A
Cited
JPS6146180A
Cited
JPS648220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |