US3744342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating piston type engines having weights for balancing primary inertial forces
Assignee: Yamaha Motor Co Ltd
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Filing: 1971-09-27
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Granted: 1973-07-10
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Expires: 1991-09-27
Abstract
Abstract A reciprocating piston type internal combustion engine comprising a small gear rotatably mounted between one of crank arms and a connecting rod by means of a pivot provided on said one crank arm in the same phase as a crank-pin and projecting toward the connecting rod, an internal gear having a number of teeth twice that of said small gear and fixedly mounted on the inner wall of a crankcase in meshing engagement with said small gear, a rotating balance weight provided on said small gear in such a way that it is in its lower position when the crank-pin is in the top dead center, and a revolving balance weight provided on the crank arms on the side opposite to the crank-pin with respect to crank journals.
Inventors
- 👤 H Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:55
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/22; F16F15/26; F16F15/264; F01; F01B; F01B9/00; F01B9/02; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2173; Y10T74/2183; Y10T74/2184
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
A reciprocating piston type internal combustion engine having a crankcase, a crank-shaft rotatably mounted in said crankcase and including crank journals, crank arms and a crank-pin, a piston and a connecting rod having the opposite ends thereof rotatably connected to said crank-pin and said piston respectively, said engine comprising a. a pivot provided on one of the crank arms in the same phase as and rigidly fixed to the crank-pin and protruding toward the connecting rod, b. a small gear rotatably mounted on said pivot between said one of the crank arms and the connecting rod, and being in side-byside relation with the large diameter end of the connecting rod, c. an internal gear having a number of teeth twice that of said small gear and fixed to the crankcase in meshing engagement with said small gear, d. a rotating balance weight provided on said small gear adjacent to one side of the connecting rod in such a way that it will be in its lower position when the crank-pin is in the top dead center, and e. revolving balance weight provided on said crank arms on the side opposite to the crank-pin with respect to the crank journals.
Claim 2
Dependent Claim
199 words
A reciprocating piston type internal combustion engine having a crankcase, a crank-shaft rotatably mounted in said crankcase and including crank journals, crank arms and a crank-pin, a piston and a connecting rod having the opposite ends thereof rotatably connected to said crank-pin and said piston respectively, said engine comprising a. a pivot provided on one of the crank arms in the same phase as and rigidly fixed to the crank-pin and protruding toward the connecting rod, b. a small gear rotatably mounted on said pivot between said one of the crank arms and the connecting rod, and being in side-byside relation with the large diameter end of the connecting rod, c. an internal gear having a number of teeth twice that of said small gear and fixed to the crankcase in meshing engagement with said small gear, d. a rotating balance weight provided on said small gear adjacent to one side of the connecting rod in such a way that it will be in its lower position when the crank-pin is in the top dead center, and e. revolving balance weight provided on said crank arms on the side opposite to the crank-pin with respect to the crank journals.
Claim 3
Dependent Claim
22 words
A reciprocating piston type internal combustion engine according to claim 1, wherein said crank-pin and said pivot are an integral straight pin.
Claim 4
Dependent Claim
83 words
A reciprocating piston type internal combustion engine according to claim 1, wherein said crank-pin and said pivot respectively consist of an inner pivot and an outer pivot which are connected integrally with each other in the shape of a crank, and the inner pivot has the small gear rotatably mounted thereon, while the outer pivot has the large diameter end of the connecting rod rotatably mounted thereon, and further the inner pivot is located closer to the crank journals than the outer pivot.
Claim 5
Dependent Claim
114 words
A reciprocating piston type internal combustion engine according to claim 2, wherein mB.RB l/2.mA mC.RC mB.l + l/2.mA + mD.l wherein mA : the reciprocating mass added to the piston-pin mB : the mass of the rotating balance weight mC : the mass of the revolving balance weight mD : the rotating mass added to the crank pin l : the distance between the center line of the crank-pin and the center line of the crank journals RB : the distance between the center of gravity of mB and the center line of the crank-pin RC : the distance between the center of gravity of mC and the center line of the crank journals.
Claim 6
Dependent Claim
59 words
A reciprocating piston type internal combustion engine according to claim 3, wherein mB.RB l/2.mA mC.RC mB.(l- r) + l/2.mA + mD. wherein mA mB, mC, mD, l, RB and RC have the meanings as defined in claim 5 and r is the distance between the center line of the inner pivot and the center line of the outer pivot.
Claim 7
Dependent Claim
131 words
A reciprocating pIston type internal combustion engine according to claim 4, wherein c l/l + RB.b wherein c : the distance between an axis along which the center of gravity of the reciprocating mass reciprocates and a plane of application of the resultant force of the centrifugal forces created by the revolving balance weight b : the distance between an axis along which the center of gravity of the reciprocating mass reciprocates and a plane of application of the resultant force of the centrifugal forces created by the rotating balance weight l : the distance between the center line of the crank-pin and the center line of the crank journals RB : the distance between the center of gravity of the rotating balance weight and the center line of the crank-pin.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |