Hydromechanical transmission
AssigneeSundstrand Corporation
InventorKenneth B. Sugden
Life of this patent
Estimating the term…
Abstract
A hydromechanical transmission including an input shaft, an axial piston hydraulic pump assembly associated with the shaft to be driven thereby, a pivotal swash plate operatively associated with the pump for selectively varying the displacement thereof, an axial piston hydraulic motor assembly coaxial with the pump, and a floating valve plate disposed between and engaging the pump and motor. A sun gear is carried by the motor, while a ring gear is carried by the pump. A rotatable output carrier is coaxial with the shaft and carries at least one planet gear engaged with both the sun and ring gears. The output of the transmission is taken from the carrier.
Claims8
A hydromechanical transmission, comprising:
- an input shaft;
- an axial piston hydraulic pump assembly associated with said shaft to be driven thereby;
- a movable swashplate operatively associated with said pump for selectively varying the displacement thereof;
- an axial piston hydraulic motor assembly coaxial with said pump;
- a floating valve plate disposed between and engaging said pump and said motor;
- a sun gear carried by one of said pump and said motor;
- a ring gear carried by the other of said pump and motor;
- a rotatable output carrier coaxial with said pump;
- and
- at least one planet gear carried by said carrier and meshed with both said sun and ring gears.
A hydromechanical transmission, comprising:
- an input shaft;
- an axial piston hydraulic pump assembly secured to said shaft for rotation therewith;
- a movable swashplate operatively associated with said pump for selectively varying the displacement thereof;
- an axial piston hydraulic motor assembly coaxial with said pump and remote from said swashplate;
- a valve plate disposed between and engaging said pump and said motor;
- a sun gear carried by said motor;
- a ring gear carried by said pump remote from said swashplate;
- a rotatable output carrier coaxial with said shaft and surrounding said motor;
- at least one planet gear carried by said carrier and meshed with both said sun and ring gears.
A hydromechanical transmission, comprising:
- an axial piston hydraulic pump assembly;
- a pivotal swashplate operatively associated with said pump for selectively varying the displacement thereof;
- means for relatively rotating said pump and said swashplate about a predetermined axis;
- an axial piston hydraulic motor assembly coaxial with said pump axis and journalled for rotation relative to said pump about said axis;
- a floating valve plate disposed between said pump and said motor to establish a hydraulic fluid flow path therebetween, said valve plate including a stem extending through one of said pump and said motor;
- a conduit in said stem and adapted to be connected to a source of hydraulic fluid;
- a sun gear carried by one of said pump and said motor;
- a ring gear carried by the other of said pump and motor;
- a rotatable output carrier coaxial with said motor;
- and
- at least one planet gear carried by said carrier and meshed with both said sun and ring gears.
A hydromechanical transmission, comprising:
- an input shaft;
- an axial piston hydraulic pump assembly associated with said shaft to be driven thereby;
- a movable swashplate operatively associated with said pump for selectively varying the displacement thereof;
- an axial piston hydraulic motor assembly coaxial with said pump;
- interconnecting valve means disposed between said pump and said motor;
- a sun gear carried by one of said pump and said motor;
- a ring gear carried by the other of said pump and motor;
- a rotatable output carrier coaxial with said pump;
- at least one planet gear carried by said carrier and meshed with both said sun and ring gears;
- said gears being coplanar and lying in a plane located between said pump and motor assemblies.
Dependencies are inferred from the claim text.