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US3893350A Expired / Lapsed US ⏱️ 0.0 years remaining

Variable ratio transmission with reverse drive

Assignee: Individual
•
Filing: 1974-06-03
•
Granted: 1975-07-08
•
Expires: 1994-06-03
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Abstract

Abstract Transmission adapted to effect a variable ratio forward and reverse drive for snowmobiles, all terrain vehicles, passenger vehicles, trucks and the like. The transmission includes a single planetary gear set with the output shaft directly secured to the ring gear and the sun gear adapted to be coupled to the input shaft by means of a fluid coupling. An axially displaceable control member selectively locks or unlocks the planet carrier to the input shaft. A brake system serves to stop rotation of the planet carrier when unloaded. A control linkage simultaneously applies the brake to the planet carrier and moves the control member to unlocking position. For reverse drive, the planet carrier is braked and unlocked from the input shaft and gradual fluid coupling between the input shaft and the sun gear causes gradual acceleration of the output shaft in reverse direction, because the planet gears rotate the ring gear in reverse. For forward drive, the brake system is released and the planet carrier locked to the input shaft. The sun gear is gradually locked to the input shaft by means of the fluid drive, resulting in the progressive obtention of a one-to-one ratio between the input and output shafts.

Inventors

  • 👤 Claude A Gingras

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 15:10
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H47/085; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19442; Y10T74/19451; Y10T74/19465

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 257 words
A variable ratio transmission with reverse drive comprising an input shaft means, an output shaft means, a planetary gear set including a ring gear secured to said output shaft means, a sun gear, a freely rotatable planet carrier and planet gears freely rotatable on said planet carrier and intermeshing with said sun gear and said ring gear, means to releasably brake said planet carrier against rotation, means to releasably lock said planet carrier to said input shaft means, control means to effect release of said locking means and braking of said braking means, and vice versa, and a fluid coupling including an impeller member secured to said input shaft means and a turbine member secured to said sun gear, whereby acceleration of said input shaft means causes progressive coupling of said sun gear to said input shaft means, said input and output shaft means being coaxially mounted, together with said impeller and turbine members of said fluid coupling, said input and output shaft means having communicating adjacent hollow portions and said locking means include a rod located within and axially movable relative to said input and output shaft means hollow portions, a cross pin secured to said rod and extending through elongated slots made in the hollow portion of said output shaft means, a sliding ring surrounding said output shaft means and connected to said cross pin, and locking members rotatably carried by said input shaft portion and radially movable into locking arrangement with said planet carrier upon axial movement of said rod in one axial direction.
Claim 2
Dependent Claim 257 words
A variable ratio transmission with reverse drive comprising an input shaft means, an output shaft means, a planetary gear set including a ring gear secured to said output shaft means, a sun gear, a freely rotatable planet carrier and planet gears freely rotatable on said planet carrier and intermeshing with said sun gear and said ring gear, means to releasably brake said planet carrier against rotation, means to releasably lock said planet carrier to said input shaft means, control means to effect release of said locking means and braking of said braking means, and vice versa, and a fluid coupling including an impeller member secured to said input shaft means and a turbine member secured to said sun gear, whereby acceleration of said input shaft means causes progressive coupling of said sun gear to said input shaft means, said input and output shaft means being coaxially mounted, together with said impeller and turbine members of said fluid coupling, said input and output shaft means having communicating adjacent hollow portions and said locking means include a rod located within and axially movable relative to said input and output shaft means hollow portions, a cross pin secured to said rod and extending through elongated slots made in the hollow portion of said output shaft means, a sliding ring surrounding said output shaft means and connected to said cross pin, and locking members rotatably carried by said input shaft portion and radially movable into locking arrangement with said planet carrier upon axial movement of said rod in one axial direction.
Claim 3
Dependent Claim 26 words
A transmission as claimed in claim 1, further including manually-operable control means to axially displace said sliding ring and, simultaneously, actuate said planet carrier braking means.

References Cited (Backward Citations)

US1204379A Cited
US1234802A Cited
US1704433A Cited
US1814442A Cited
US3543607A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-07-07 1979-01-06 1979-07-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-07-07 1983-01-06 1983-07-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-07-07 1987-01-06 1987-07-08 $7700.00 Window Closed / Lapsed

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