US3811528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle motor mounts
Assignee: Norton Villiers Ltd
•
Filing: 1972-03-29
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Granted: 1974-05-21
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Expires: 1992-03-29
Abstract
Abstract This specification describes a motor cycle which includes a frame, a two-cylinder internal-combustion piston engine mounted in the frame, the cylinders of the engine having their longitudinal axes in a common plane containing the rotary axis of the crankshaft which has its crank throws spaced by 180*, a gear box driven by the engine and a driven wheel driven by a final drive from the gear box. The motor cycle has an engine unit which includes the engine, a fork carrying the driven wheel for rotation about a first axis and mounted in a mounting fixed in position relative to the frame for pivotal movement about a second axis, the first and second axes being mutually parallel and parallel to said crankshaft axis, balancing means carried by said crankshaft and which statically balances between 90 and 110 percent of the rotating mass of the engine only, and mountings between the engine unit and the frame to support the engine unit in the frame so that in operation the engine unit oscillates about an axis of oscillation generally perpendicular to an axial plane containing the longitudinal axes of the cylinders, the mountings being arranged so that they resiliently resist oscillatory movement of the engine about said axis of oscillation.
Inventors
- 👤 B Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:10
CPC Classifications
B; B62; B62K; B62K11/00; B62K11/02; B62K11/04; B60; B60K; B60K5/00; B60K5/12; B62M; B62M7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
386 words
A vehicle comprising: a frame; an engine unit mounted on the frame and including a two-cylinder, internal combustion engine having a crankshaft with two crank pins spaced 180* about the rotary axis of the crankshaft, a piston reciprocable in each cylinder, a connecting rod associated with each piston and interconnecting the piston with one of said crank pins through a big end bearing, balancing means on the crankshaft diametrically opposite to each crank pin, each such balancing means being arranged to produce a moment about said crankshaft axis equal to between 90 and 110 percent of the moment about said crankshaft axis produced by the weight of the big end portion of each connecting rod when the other end is freely suspended, such weight being assumed to be concentrated at the axis of the crank pin with which the connecting rod is engaged, the longitudinal axes of the cylinder lying in a common plane containing the rotary axis of the crankshaft and the engine unit tending when the engine is in operation, to oscillate about an axis of oscillation which makes an angle of between 80* and 100* with the common plane; a gearbox, a driven wheel driven by a final drive from the gearbox; a fork carrying the driven wheel for rotation about a first axis and mounted in a mounting fixed in position relative to the frame for pivotal movement about a second axis, the first and second axes being mutually parallel and parallel to the rotary axis of the crankshaft; resilient mountings interposed between the engine unit and the frame to exert restoring forces on the engine unit upon angular displacement of the engine unit about the axis of oscillation, the resilient mountings being so disposed relative to first and second planes containing the axis of oscillation and respectively perpendicular to and parallel to the rotary axis of the crankshaft that the sum of the stiffness moments about the axis of oscillation of said restoring forces exerted by the mountings on one side of each of said planes due to a unit angular displacement of the engine unit about said axis of oscillation is equal to the sum of the stiffness moments about the axis of oscillation of the restoring forces exerted by the mountings on the other side of the respective plane.
Claim 2
Dependent Claim
386 words
A vehicle comprising: a frame; an engine unit mounted on the frame and including a two-cylinder, internal combustion engine having a crankshaft with two crank pins spaced 180* about the rotary axis of the crankshaft, a piston reciprocable in each cylinder, a connecting rod associated with each piston and interconnecting the piston with one of said crank pins through a big end bearing, balancing means on the crankshaft diametrically opposite to each crank pin, each such balancing means being arranged to produce a moment about said crankshaft axis equal to between 90 and 110 percent of the moment about said crankshaft axis produced by the weight of the big end portion of each connecting rod when the other end is freely suspended, such weight being assumed to be concentrated at the axis of the crank pin with which the connecting rod is engaged, the longitudinal axes of the cylinder lying in a common plane containing the rotary axis of the crankshaft and the engine unit tending when the engine is in operation, to oscillate about an axis of oscillation which makes an angle of between 80* and 100* with the common plane; a gearbox, a driven wheel driven by a final drive from the gearbox; a fork carrying the driven wheel for rotation about a first axis and mounted in a mounting fixed in position relative to the frame for pivotal movement about a second axis, the first and second axes being mutually parallel and parallel to the rotary axis of the crankshaft; resilient mountings interposed between the engine unit and the frame to exert restoring forces on the engine unit upon angular displacement of the engine unit about the axis of oscillation, the resilient mountings being so disposed relative to first and second planes containing the axis of oscillation and respectively perpendicular to and parallel to the rotary axis of the crankshaft that the sum of the stiffness moments about the axis of oscillation of said restoring forces exerted by the mountings on one side of each of said planes due to a unit angular displacement of the engine unit about said axis of oscillation is equal to the sum of the stiffness moments about the axis of oscillation of the restoring forces exerted by the mountings on the other side of the respective plane.
Claim 3
Dependent Claim
37 words
A vehicle according to claim 1 wherein the resilient mountings are arranged so that they have a greater deflection per unit load in circumferential directions about the axis of oscillation than in directions parallel to said axis.
Claim 4
Dependent Claim
31 words
A vehicle according to claim 1 in which the engine unit includes the gearbox which is rigid with the engine and the mounting for the fork is secured to the frame.
Claim 5
Dependent Claim
38 words
A vehicle according to claim 1 wherein the gearbox is mounted on the frame and the engine unit oscillates relative to the gearbox, the mounting for the fork being secured to one of the frame and the gearbox.
Claim 6
Dependent Claim
61 words
A vehicle according to claim 1 in which each of said pistons and cylinders is stepped having a working part and a pumping part, the pumping parts being of larger diameter than the working parts and in which the pumping parts of the pistons transfer charge from the pumping part of each cylinder to the working part of the other cylinder.
References Cited (Backward Citations)
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Cited
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Cited
US2454991A
Cited
US2574602A
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |