US4027544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
V-belt variable-speed drive
Assignee: Yamaha Motor Co Ltd
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Filing: 1976-04-23
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Granted: 1977-06-07
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Expires: 1996-04-23
Abstract
Abstract A V-belt variable-speed drive has a driving shaft; a stationary sheave fixedly mounted on the driving shaft; a sliding sheave assembly including a sliding sheave facing the stationary sheave and a casing covering the backside of the sliding sheave and designed to slide in the axial direction of the driving shaft, though normally urged to be set apart from the stationary sheave; self-sliding bearings for mounting the sliding sheave and casing on the driving shaft; a rotation-transmitting unit fixed to the driving shaft to transmit its rotation to the sliding sheave assembly while allowing the sliding sheave assembly to slide in the axial direction of the driving shaft; and a sliding sheave assembly-displacing unit for steplessly varying the rotating speed of a driven shaft by adjusting an interval between the stationary and sliding sheaves and regulating the radial position of the V-belt lying between both sheaves in accordance with the rotating speed of the driving shaft, wherein application of the self-aligning type bearings enables the sliding sheave assembly to be smoothly shifted in the axial direction of the driving shaft even when the V-belt applies a localized reaction force to the sliding sheave.
Inventors
- 👤 Takashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:46
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/32; F16H55/52; F16H55/56; F16H55/563
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
258 words
A V-belt variable-speed drive comprising: a driving shaft; a stationary sheave concentrically fixed to said driving shaft; sliding sheave means having a sliding sheave facing the stationary sheave and supported by at least two central portions penetrated by the driving shaft, said central portions having a spherical inner surface; at least two bearings mounted on the driving shaft and being slideable axially thereof, each of the bearings having a cylindrical inner surface which contacts the outer surface of the driving shaft and each of the bearings having a spherical outer surface shaped complementary to the inner surfaces of said central portions of the sliding sheave means, the complementary spherical outer surface of the respective bearings being concentered as the spherical surfaces of said central portions of the sliding sheave means, and said bearings being inserted into the corresponding central portions of the sliding sheave means with the sperical outer surface of said bearings being contacted by the spherical inner surface of the corresponding central portions; an endless belt passing between the stationary sheave and the sliding sheave; rotation-transmitting means disposed between the driving shaft and the sliding sheave means to transmit the rotation of the driving shaft to the siding sheave; displacing means disposed between the driving shaft rotation-transmitting means and the sliding sheave means to draw the sliding sheave nearer to the stationary sheave as the driving shaft is rotated at a more accelerated speed; and urging means for urging the sliding sheave in the direction in which the sliding sheave is separated from the stationary sheave.
Claim 2
Dependent Claim
258 words
A V-belt variable-speed drive comprising: a driving shaft; a stationary sheave concentrically fixed to said driving shaft; sliding sheave means having a sliding sheave facing the stationary sheave and supported by at least two central portions penetrated by the driving shaft, said central portions having a spherical inner surface; at least two bearings mounted on the driving shaft and being slideable axially thereof, each of the bearings having a cylindrical inner surface which contacts the outer surface of the driving shaft and each of the bearings having a spherical outer surface shaped complementary to the inner surfaces of said central portions of the sliding sheave means, the complementary spherical outer surface of the respective bearings being concentered as the spherical surfaces of said central portions of the sliding sheave means, and said bearings being inserted into the corresponding central portions of the sliding sheave means with the sperical outer surface of said bearings being contacted by the spherical inner surface of the corresponding central portions; an endless belt passing between the stationary sheave and the sliding sheave; rotation-transmitting means disposed between the driving shaft and the sliding sheave means to transmit the rotation of the driving shaft to the siding sheave; displacing means disposed between the driving shaft rotation-transmitting means and the sliding sheave means to draw the sliding sheave nearer to the stationary sheave as the driving shaft is rotated at a more accelerated speed; and urging means for urging the sliding sheave in the direction in which the sliding sheave is separated from the stationary sheave.
Claim 3
Dependent Claim
45 words
A V-belt variable-speed drive according to claim 1, wherein said sliding sheave means includes a casing for covering the rear side of the sliding sheave, and said central portions of said sliding sheave means respectively comprise the hubs of the sliding sheave and the casing.
Claim 4
Dependent Claim
68 words
A V-belt variable-speed drive according to claim 2, wherein each of said hubs of the sliding sheave and the casing is provided with a pair of slit shaped bearing-inserting sections arranged symmertrical with each other with respect to the axis of the driving shaft, each of said bearing inserting sections having a width slightly larger than the width of the corresponding bearing and extending along the driving shaft.
Claim 5
Dependent Claim
85 words
A V-belt variable-speed drive according to claim 2, wherein said driving shaft rotation-transmitting means comprises a plurality of pairs of sliding arms arranged at an equal circumferential distance and projecting from the sliding sheave to depart from the stationary sheave, said sliding arms having mutually facing inner surfaces, and a driving shaft rotation-transmitting unit fixed to the driving shaft and provided with guide arms extending outward radially between the corresponding paired sliding arms for contact with the mutually facing inner surfaces of said sliding arm.
Claim 6
Dependent Claim
61 words
A V-belt variable-speed drive according to claim 4, wherein said driving shaft rotation-transmitting unit includes respective rollers rotatably coupled to end portions of said guide arms, and said displacing means comprises a plurality of cammed weight members pivotally mounted to the sliding sheave, said cammed weight members having respective cam surfaces for contacting said rollers of the driving shaft rotation-transmitting unit.
Claim 7
Dependent Claim
21 words
A V-belt variable-speed drive according to claim 4, wherein said driving shaft rotation-transmitting means is provided in the sliding sheave means.
Claim 8
Dependent Claim
24 words
A V-belt variable-speed drive according to claim 6, wherein there is provided a viewing window on the casing for observing the internal operation thereof.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |