Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1980-02-19
1985-05-14
Braun, Leslie A.
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
192 12C, 192 13R, F16H 344, F16H 5710, B60K 4124, F16D 6702
Patent
active
045164444
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to power drives and in particular to power drives for use with a hydrostatic motor.
2. Background Art
In one prior art drive system disclosed in U.S. Pat. No. 4,051,933 of Jene A. Beneke et al, a low inertia clutch and brake system includes a rotatable shaft in high and low speed clutch assemblies spaced apart along the shaft. A brake assembly is disposed between the high and low clutch assemblies and includes friction means normally engaged with the housing to prevent rotation of the shaft. Fluid operated pistons are provided for selectively disengaging the brake assembly and engaging one of the clutch assemblies.
In U.S. Pat. No. 4,078,639, Jene A. Beneke discloses a two-speed clutch and brake system utilizing high and low speed clutch assemblies spaced apart along a rotatable shaft. A brake assembly is mounted between the clutch assemblies. Adjacent ones of the pistons and brake plates are interconnected so that the brake assembly is disengaged when either of the clutch assemblies is engaged. The structure is arranged so that when both of the clutch assemblies are disengaged, the brake plates engage the friction surfaces with a stationary housing to brake the shaft.
A transmission unit is shown, in U.S. Pat. No. 4,128,023 of Mark R. Kinder, to include cooperating gearing and clutches wherein both clutches may be disengaged in a free-wheeling mode, or selectively disengaged, against biasing means urging the clutches to engaged condition. The unit requires a ring gear fixed to the housing engaged by the planet gears meshed with the output shaft sun gear.
DISCLOSURE OF INVENTION
The present invention comprehends an improved power drive utilizing a pair of clutches driven from a single speed range drive motor to provide a multiple speed range output and a braking of the output as a result of selective control of the clutches.
More specifically, the invention comprehends providing such a power drive including means for selectively actuating the clutch means, and means for causing the output member to be selectively driven by the drive motor through the clutch means and gearing of the drive selectively in a low speed range and a high speed range, or braked as an incident of the selective actuation of the clutches.
The means for actuating the clutch means may comprise first and second piston means, respectively actuating the first and second clutches. The selective actuation of the clutches is effective solely by the control of the piston means.
In one of the driven connections provided by the clutch means, the output member is driven directly from the drive motor.
The drive mechanism may be arranged to provide a braked condition of the output member when the drive motor is stopped and brake release pressure is dropped.
Further more specifically, the invention comprehends such an improved power drive including a first element, a rotary power input element and a rotary power output element, an improved power transmission system for controlled connection of the input and output elements to provide selectively a high speed output, a low speed output, and a braked condition of the output, said improved power transmission system including a ring gear connected to the input element for rotation therewith, a sun gear coaxially of the ring gear, planet gears intermeshed with the ring and sun gears, carrier means carrying the planet gears and drivingly connected to the output element, first clutch means for selectively locking the sun gear to the fixed element, and second clutch means for selectively locking the sun gear to the ring gear, whereby the power transmission system selectively causes (a) the input element to be locked to the fixed element as a result of the first clutch means being arranged to lock the sun gear to the fixed element and the second clutch means being arranged to lock the sun gear to said ring gear, (b) the input element directly drives the output element as a result of the second clutch means being arranged to lock the sun gear to the r
REFERENCES:
patent: 2115964 (1938-05-01), Osborne
patent: 2683997 (1954-07-01), Forster
patent: 2918832 (1959-12-01), Meyers
patent: 3164036 (1965-01-01), Lamburn et al.
patent: 3605507 (1971-09-01), Ishihara et al.
patent: 3797332 (1974-03-01), Cameron et al.
patent: 3978742 (1976-09-01), Abbott
patent: 4051933 (1977-10-01), Beneke et al.
patent: 4067427 (1978-01-01), Cackley
patent: 4078639 (1978-03-01), Beneke
patent: 4128023 (1978-12-01), Kinder
Braun Leslie A.
Caterpillar Tractor Co.
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