Small vehicle transmission
First Claim
1. A small engine transmission, comprising a hydromechanical transmission unit which includes an F unit and a V unit, an input shaft and an output shaft, providing a first power path, a mechanical power transmission unit providing a second power path in parallel with the first power path, the mechanical power transmission unit being a planetary gear system having a planetary carrier, the hydromechanical transmission being so associated with the mechanical power transmission to decrease average hydraulic power flow of the small engine transmission to thereby increase operating efficiency and to permit the reduction of an output speed range to reduce transmitted power for the use of multiple modes to achieve a full torque and speed range of the transmission.
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Accused Products
Abstract
A small engine transmission having a hydromechanical transmission unit providing a first power path, and a mechanical power transmission unit providing a second power path. The mechanical power transmission is a planetary gear system having a planetary carrier. The hydromechanical transmission is associated with the mechanical transmission to decrease average hydraulic power flow of the engine transmission to thereby increase operating efficiency and to permit the reduction of an output speed range to reduce transmitted power for the use of multiple modes to achieve a full torque and speed range of the transmission.
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Citations
12 Claims
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1. A small engine transmission, comprising
a hydromechanical transmission unit which includes an F unit and a V unit, an input shaft and an output shaft, providing a first power path, a mechanical power transmission unit providing a second power path in parallel with the first power path, the mechanical power transmission unit being a planetary gear system having a planetary carrier, the hydromechanical transmission being so associated with the mechanical power transmission to decrease average hydraulic power flow of the small engine transmission to thereby increase operating efficiency and to permit the reduction of an output speed range to reduce transmitted power for the use of multiple modes to achieve a full torque and speed range of the transmission.
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5. A small engine transmission unit, comprising,
an HMT with three operational modes, the third mode being independent in ratio spread from the other two modes, the third mode being comprised of a planetary, at least two associated drive gears and one clutch associated with components of the second mode.
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9. A small engine transmission, comprising,
a center housing configuration, a pair of hydrostatic units in the center housing and including shafts and drive gears, a hydraulic reservoir, and a clutch assembly, a pair of end covers on opposite ends of the center housing and containing at least one of mechanical shafts, non-hydrostatic transmission drive gears, transmission mounting and a second clutch assembly.
Specification